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git://git.code.sf.net/p/cdesktopenv/code
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b40155fae8
This commit fixes two file descriptor leaks in the hist built-in. The bugfix for the first file descriptor leak was backported from ksh2020. See: https://github.com/att/ast/issues/872 https://github.com/att/ast/commit/73bd61b5 Reproducer: $ echo no $ hist -s no=yes The second file descriptor leak occurs after a substitution error in the hist built-in (this leak wasn't fixed in ksh2020). Reproducer: $ echo no $ ls /proc/$$/fd $ hist -s no=yes $ hist -s no=yes $ ls /proc/$$/fd src/cmd/ksh93/bltins/hist.c: - Close leftover file descriptors when an error occurs and after 'hist -s' runs a command. src/cmd/ksh93/tests/builtins.sh: - Add two regression tests for both of the file descriptor leaks.
1430 lines
58 KiB
Text
1430 lines
58 KiB
Text
This documents significant changes in the 93u+m branch of AT&T ksh93.
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For full details, see the git log at: https://github.com/ksh93/ksh
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Any uppercase BUG_* names are modernish shell bug IDs.
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2021-11-15:
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- In arithmetic evaluation, the --posix compliance option now disables the
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special floating point constants Inf and NaN so that $((inf)) and $((nan))
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refer to the variables by those names as the standard requires. (BUG_ARITHNAN)
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- Fixed two file descriptor leaks in the hist builtin that occurred when
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the -s flag ran a command or encountered an error.
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2021-11-14:
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- Fixed: ksh crashed after unsetting .sh.match and then matching a pattern.
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- Another test/[ fix: "test \( string1 -a string2 \)" and "test \( string1 -o
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string2 \)" no longer give an incorrect "argument expected" error message.
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2021-11-13:
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- The test/[ built-in command now supports the '<' and '=~' operators from [[.
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As of now, test/[ supports the same operators as [[ except for the different
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and/or operators. Note: test/[ remains deprecated due to its many pitfalls.
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- The test/[ built-in command is fixed so that the binary -a (and) and -o (or)
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operators, as in [ "$a" -a "$b" ] or [ "$a" -o "$b" ], work even if "$a" is
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'!' or '('. To avoid breaking backwards compatibility with the nonstandard
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unary [ -a "$file" ] and [ -o "$option" ] operators in combination with '!'
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or parentheses, this fix is only activated if the posix option is on.
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2021-11-07:
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- Fixed a bug that could corrupt output if standard output is closed upon
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initializing the shell.
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- Improved BUG_PUTIOERR fix (2020-05-14) with more error checking. On
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systems with the "disk full" error testing device /dev/full, an
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echo/print/printf to /dev/full now always yields a non-zero exit status.
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2021-09-13:
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- Fixed a bug introduced in 93u+ 2012-02-07 that caused the 'printf' builtin
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(and its 'print -f' equivalent) to fail to recognise integer arguments with a
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leading zero as octal numbers. For example, 'printf "%d\n" 010' now once
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again outputs '8' instead of '10'.
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- Disable the POSIX arithmetic context while running a command substitution
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invoked from within an arithmetic expression. This fixes a bug that caused
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integer arguments with a leading zero to be incorrectly interpreted as octal
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numbers in non-POSIX arithmetic contexts within such command substitutions.
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2021-09-12:
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- When invoking a script without an interpreter/hashbang path on Linux and
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macOS, ksh can now update 'ps' output to show longer command lines.
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2021-08-13:
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- An issue was fixed that could cause old-style `backtick` command
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substitutions to hang in certain cases.
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2021-06-03:
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- Fixed a bug in the [[ compound command: the '!' logical negation operator
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now correctly negates another '!', e.g., [[ ! ! 1 -eq 1 ]] now returns
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0/true. Note that this has always been the case for 'test'/'['.
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2021-05-18:
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- Fixed SHLVL so that replacing ksh by itself (exec ksh) will not increase it.
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- Fixed a regression introduced on 2020-08-05 that caused a non-interactive
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shell to exit if an I/O redirection of a function call encountered an error.
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2021-05-13:
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- Fixed a bug with 'test -t 1' that was introduced on 2021-04-26:
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v=$(test -t 1 >/dev/tty && echo ok) did not assign 'ok' to v.
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2021-05-10:
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- Release 1.0.0-beta.1.
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2021-05-07:
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- Backported three ksh 93v- math.tab changes, allowing for an exp10()
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arithmetic function if one exists in the C library, a new float()
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function, and lastly an updated int() function that rounds to zero
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instead of being an alias to floor().
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2021-05-05:
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- Fixed: a preceding variable assignment like foo=bar in 'foo=bar command'
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(with no command arguments after 'command') incorrectly survived the
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'command' regular built-in command invocation.
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- Fixed: 'command -p some_utility' intermittently failed to find the utility
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under certain conditions due to a memory corruption issue.
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2021-05-03:
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- Subshells (even if non-forked) now keep a properly separated state of the
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pseudorandom generator used for $RANDOM, so that using $RANDOM in a
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non-forked subshell no longer influences a reproducible $RANDOM sequence in
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the parent environment. In addition, upon invoking a subshell, $RANDOM is now
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reseeded (as mksh and bash do).
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- Fixed program flow corruption that occurred in scripts on executing a
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background job in a nested subshell, as in ( ( simple_command & ) ).
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- Completed the 2021-04-30 fix for ${var<OP>'{}'} where <OP> is '-', '+',
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':-' or ':+' by fixing a bug that caused an extra '}' to be output.
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- Following the resolution of Austin Group bug 1393[*] that is set to be
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included in the next version of the POSIX standard, the 'command' prefix
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in POSIX mode (set -o posix) no longer disables the declaration properties
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of declaration built-ins. This reverts a change introduced on 2020-09-11.
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[*] https://austingroupbugs.net/view.php?id=1393
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- Fixed arithmetic assignment operations for multidimensional indexed arrays
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2021-04-30:
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- The emacs 'ESC .' (M-.) and vi '_' commands now take shell quoting into
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account when repeating a word from the previous command line. For example, if
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the previous command is 'ls Stairway\ To\ Heaven.mp3', then they now insert
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'Stairway\ To\ Heaven.mp3' instead of 'Heaven.mp3'. Thanks to Govind Kamat.
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- Fixed a bug introduced on 2020-09-05 that caused "echo ${var:+'{}'}"
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to be misparsed.
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- Fixed: the effects of 'builtin', 'exec' and 'ulimit' leaked out of a parent
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virtual subshell if run from a ${ shared-state; } command substitution.
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2021-04-26:
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- Fixed a bug introduced on 2021-02-20 in which a shared-state command
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substitution stopped sharing its state with the calling shell environment
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if it executed a command that locally redirected standard outpuut.
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2021-04-22:
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- shcomp (the shell bytecode compiler) was fixed to correctly compile process
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substitutions used as the file name to a redirection, as in 'cmd < <(cmd)'.
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- Fixed a bug introduced on 2020-07-13 that set LINENO to the wrong line
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number after leaving a virtual subshell in which LINENO had been unset.
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2021-04-21:
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- Fixed a bug introduced on 2020-09-28 that caused an interactive ksh to exit
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if a profile script (such as ~/.kshrc) contains a syntax error.
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2021-04-20:
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- Fixed three problems with the /opt/ast/bin/getconf built-in command:
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1. The -l/--lowercase option did not change all variable names to lower case.
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2. The -q/--quote option now quotes all string values. Previously, it only
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quoted string values that had a space or other non-shellsafe character.
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3. The -c/--call, -n/--name and -s/--standard options matched all variable
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names provided by 'getconf -a', even if none were actual matches.
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- The readonly attribute of ksh variables is no longer imported from
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or exported to other ksh shell instances through the environment.
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2021-04-16:
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- Fixed a bug in emacs mode: after using tab completion to complete the name
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of a directory, it was not possible to type numbers after the slash.
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- Fixed an optimization bug that caused the <>; redirection operator to fail
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when used with the last command in a -c script.
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2021-04-14:
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- Path-bound built-ins (such as /opt/ast/bin/cat) can now be executed by
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invoking the canonical path, so the following will now work as expected:
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$ /opt/ast/bin/cat --version
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version cat (AT&T Research) 2012-05-31
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$ (PATH=/opt/ast/bin:$PATH; "$(whence -p cat)" --version)
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version cat (AT&T Research) 2012-05-31
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Non-canonical paths such as /opt/ast/./bin/cat will not find the built-ins.
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- Path-bound built-ins will now also be found on a PATH set locally using an
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assignment preceding the command, so the following will now work as expected:
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$ PATH=/opt/ast/bin cat --version
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version cat (AT&T Research) 2012-05-31
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2021-04-13:
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- Fixed a few bugs that could cause ksh to show the wrong error message and/or
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return the wrong exit status if a command couldn't be executed. In
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scenarios where the command was found in the PATH but it was not executable,
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ksh now returns with exit status 126. Otherwise, ksh will return with exit
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status 127 (such as if the command isn't found or if the command name is
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too long).
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2021-04-12:
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- Corrected a memory fault when an attempt was made to unset the default
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nameref KSH_VERSION from the shell environment prior to any other name
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reference variable creation or modification.
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2021-04-11:
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- Fixed two related regressions introduced on 2020-06-16:
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1. The += assignment failed to append the value of variables when used
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in an invocation-local scope. The following should print '5', but
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the regression resulted in '3' being printed instead:
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$ integer foo=2; foo+=3 command eval 'echo $foo'
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3
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2. Any += assignment used in an invocation-local scope could modify
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readonly variables.
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2021-04-10:
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- Fixed: the internal count of the recursion level for arithmetic expressions
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was not reset when certain errors occurred in a virtual subshell. This could
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cause an erroneous "recursion to deep" error when a loop executed many
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subshells containing arithmetic expressions with errors, e.g. for testing.
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2021-04-09:
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- Fixed a bug that caused ksh to enable -c during the shell's initialization
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if the only argument passed was --posix.
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- Fixed a related bug that caused 'set --posix' to leave the braceexpand and
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letoctal shell options unchanged.
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- Fixed a bug that caused 'set --default' to unset the restricted option
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in restricted shells.
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2021-04-08:
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- Path-bound builtins will now be used by restricted shells if /opt/ast/bin
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is in the $PATH upon invoking the shell or before setting it to restricted.
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- Fixed a bug that caused "printf '%T\n' now" to ignore $LC_ALL and $LC_TIME
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if the current locale was previously set, unset then set again.
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2021-04-07:
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- The $LC_TIME variable is now recognized by ksh and if set to an invalid
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locale will show an error.
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- Fixed BUG_CSUBSTDO: If standard output is closed before running a command
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substitution, redirecting any other file descriptor no longer closes standard
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output inside of the command substitution.
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2021-04-05:
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- Fixed a regression, introduced in ksh 93t+ 2009-07-31, that caused a command
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like 'unset arr[3]' to unset not just element 3 of the array but all elements
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starting from 3, if a range expansion like ${arr[5..10]} was previously used.
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- Several fixes for arrays of a type created by 'enum' were backported from ksh
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93v-, further to the two enum array fixes already applied on 2021-02-01:
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1. The array[@]} expansion was fixed for associative arrays of an enum type.
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2. Assignments now work correctly for all enum values for both indexed and
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associative arrays.
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3. 'unset' will now completely unset an associative array of an enum type.
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2021-04-04:
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- A bug was fixed that caused a broken prompt display upon redrawing the
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command line if the last line of the prompt includes an xterm escape
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sequence that is terminated by $'\a' (the bell character).
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- Harden readonly variables. Readonly variables or arrays no longer allow
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attribute changes which would otherwise allow their value to be altered.
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Expanded support for readonly variables within multidimensional arrays.
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2021-04-03:
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- Fixed a bug that caused the uname builtin's -d option to change the output
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of the -o option.
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- Fixed a possible crash that could occur when showing the domain name
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with the uname builtin's -d option.
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2021-03-31:
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- Fixed a bug that caused 'cd -' to ignore the current value of $OLDPWD
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when it's set to a different directory in a new scope.
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- Fixed a related bug that caused ksh to use the wrong value for $PWD
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when in a new scope.
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2021-03-29:
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- Fixed an intermittent crash that could occur in vi mode when using the 'b'
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or 'B' commands to go back one word.
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2021-03-27:
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- The 'test' builtin will now show an error message when given the invalid ']]'
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or '=~' operators; it also properly returns with exit status 2 now (instead
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of exit status 1). If the invalid operator is supported by [[ ... ]] (such
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as '=~'), test will now suggest the usage of [[ ... ]] instead.
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2021-03-22:
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- A new --globcasedetect shell option is added to ksh on OSs where we can check
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for a case-insensitive file system (currently macOS, Windows/Cygwin, Linux
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and QNX 7.0+). When this option is turned on, file name generation
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(globbing), as well as file name tab completion on interactive shells,
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automatically become case-insensitive on file systems where the difference
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between upper- and lowercase is ignored for file names. This is transparently
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determined for each directory, so a path pattern that spans multiple file
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systems can be part case-sensitive and part case-insensitive.
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The option is not compiled into ksh on systems where we do not know of a
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method to check for file system case insensitivity. The shell option can be
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force-compiled by setting SHOPT_GLOBCASEDET to 1 in src/cmd/ksh93/SHOPT.sh,
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but it won't have any effect on non-supported systems, so this is not
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recommended. It can be removed from ksh by setting SHOPT_GLOBCASEDET to 0.
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2021-03-17:
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- Fixed a bug with file name completion on the interactive shell in multibyte
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locales. Upon encountering two filenames with multibyte characters starting
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with the same byte, a partial multibyte character was autocompleted.
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2021-03-16:
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- Tilde expansion can now be extended or modified by defining a .sh.tilde.get
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or .sh.tilde.set discipline function. This replaces a 2004 undocumented
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attempt to add this functionality via a .sh.tilde built-in, which never
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worked and crashed the shell. See the manual for details on the new method.
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- Fixed a bug in interactive shells: if a variable used by the shell called
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a discipline function (such as PS1.get() or COLUMNS.set()), the value of $?
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was set to the exit status of the discipline function instead of the last
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command run.
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2021-03-15:
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- If the HOME variable is unset, the bare tilde ~ now expands to the current
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user's system-configured home directory instead of merely the username.
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- Tighten up potential invalid typeset attribute combos when more than
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one numeric type has been requested. In particular, -F and -i are no
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longer masked over by previously given float types.
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2021-03-13:
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- Fixed a file descriptor leak that occurred when ksh used /dev/fd for
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process substitutions passed to functions.
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- Fixed a separate file descriptor leak that happened when a process
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substitution was passed to a nonexistent command.
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2021-03-11:
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- Fixed an intermittent bug that caused process substitutions to infinitely
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loop in Linux virtual machines that use systemd.
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- Fixed a bug that caused process substitutions to leave lingering processes
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if the command invoking them never reads from them.
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2021-03-09:
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- The ${!foo@} and ${!foo*} expansions yield variable names beginning with foo,
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but excluded 'foo' itself. The fix for this is now backported from 93v- beta.
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- test -v var, [ -v var ], and [[ -v var ]] did not correctly test if a
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variable is set or unset after it has been given a numeric attribute with
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'typeset' but not yet assigned a value. This has been fixed so that
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[[ -v var ]] is now equivalent to [[ -n ${var+set} ]] as documented.
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2021-03-07:
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- Fixed the typeset -p display of short integers without an assigned value.
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Also, the last -s or -l attribute option supplied for an integer is used.
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- Fixed a bug with -G/--globstar introduced on 2020-08-09: patterns did not
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match anything if any pathname component was '.' or '..', e.g. '**/./glob.c'
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never matched. The 2020-08-09 fix does still apply to patterns like '.*'.
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- Enhancement to -G/--globstar: symbolic links to directories are now followed
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if they match a normal (non-**) glob pattern. For example, if '/lnk' is a
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symlink to a directory, '/lnk/**' and '/l?k/**' now work as you would expect.
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- Fixed a bug introduced on 2021-02-11 that caused job control on interactive
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ksh sessions to misbehave if the login shell was replaced by ksh using 'exec'.
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2021-03-06:
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- Fixed an old expansion bug: expansions of type ${var=value} and ${var:=value}
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did not perform an assignment and yielded the value 0 if 'var' was typeset as
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numeric (integer or float) but had not yet been assigned a value.
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- Fixed a bug introduced on 2020-08-19: Ctrl+D would break after an
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interactive shell received SIGWINCH.
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- Fixed a bug introduced on 2020-05-21: on an interactive shell, command lines
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containing a syntax error were not added to the command history file and
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sometimes corrupted the command history.
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2021-03-05:
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- Unbalanced quotes and backticks now correctly produce a syntax error
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in -c scripts, 'eval', and backtick-style command substitutions.
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2021-03-04:
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- Fixed an arbitrary command execution vulnerability that occurred when
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parsing the subscripts of arrays within arithmetic commands and expansion.
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2021-03-01:
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- Fixed the retention of size attributes when 'readonly' or 'typeset -r'
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was applied to an existing variable.
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2021-02-26:
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- Fixed three long-standing bugs with tab completion in the emacs editor:
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1. The editor accepted literal tabs without escaping in certain cases,
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causing buggy and inconsistent completion behaviour. Details:
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https://github.com/ksh93/ksh/issues/71#issuecomment-656970959
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https://github.com/ksh93/ksh/issues/71#issuecomment-657216472
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To enter a literal tab in emacs, you need to escape it with ^V or \.
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2. After completing a filename by choosing from a file completion menu,
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the terminal cursor was placed one position too far to the right,
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corrupting command line display. This happened with multiline active.
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Details: https://github.com/ksh93/ksh/issues/71#issue-655093805
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3. A completion menu was displayed if the file name to be completed was
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at the point where the rest of it started with a number, even if that
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part uniquely identified it so the menu only showed one item. Details:
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https://www.mail-archive.com/ast-users@lists.research.att.com/msg00436.html
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- A bug with ${.sh.fun} in combination with the DEBUG trap has been fixed.
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The ${.sh.fun} variable wrongly continued to contain the name of the last
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function executed by the DEBUG trap after the trap action completed.
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2021-02-21:
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- Fixed: The way that SIGWINCH was handled (i.e. the signal emitted when the
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terminal window size changes) could cause strange emacs/vi editor behaviour.
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2021-02-20:
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- Fixed a bug introduced on 2021-01-20: if a DEBUG trap action yielded exit
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status 2, the execution of the next command was not skipped as documented.
|
|
|
|
- Fixed multiple buffer overflows causing crashes in typeset -L/-R-/-Z.
|
|
|
|
- Fixed typeset -Z zero-filling: if the number was zero, all zeros
|
|
were skipped when changing the initial size value of the -Z attribute,
|
|
leaving an empty string.
|
|
|
|
2021-02-18:
|
|
|
|
- A bug was fixed in the 'read' builtin that caused it to fail to process
|
|
multibyte characters properly in Shift-JIS locales.
|
|
|
|
2021-02-17:
|
|
|
|
- Emacs mode fixes:
|
|
1. Erasing a backslash while doing a reverse search (^R) no longer deletes
|
|
extra characters.
|
|
2. The backslash now escapes a subsequent interrupt (^C) as documented.
|
|
|
|
- Fixed a longstanding bug with shared-state command substitutions of the form
|
|
${ command; }. If these were executed in a subshell, changes made within
|
|
could survive not only the command substitution but also the parent subshell.
|
|
|
|
2021-02-15:
|
|
|
|
- Fixed a regression introduced by ksh93 (was not in ksh88): an empty 'case'
|
|
list on a single line ('case x in esac') was a syntax error.
|
|
|
|
- Fixed a bug in the emacs built-in editor, introduced on 2020-09-17, that
|
|
made the Meta-D and Meta-H keys delete single characters instead of words.
|
|
|
|
- A new 'backslashctrl' shell option has been added. It is on by default.
|
|
Turning it off (set +o backslashctrl or set --nobackslashctrl) disables the
|
|
special escaping behaviour of the backslash character in the emacs and vi
|
|
built-in editors. Particularly in the emacs editor, this makes it much easier
|
|
to go back, insert a forgotten backslash into a command, and then continue
|
|
editing without having your next cursor key replace your backslash with
|
|
garbage. Note that Ctrl+V (or whatever other character was set using
|
|
'stty lnext') always escapes all control characters in either editing mode.
|
|
|
|
2021-02-14:
|
|
|
|
- Due to a deficiency in some UNIX veriants, the 'sleep' built-in command could
|
|
occasionally sleep for slightly less than the time specified. It now performs
|
|
an additional check against the system clock to make sure it sleeps at least
|
|
the given amount of time. Thanks to Lev Kujawski for adding this feature.
|
|
|
|
- A few bugs were fixed that 93u+m introduced along with the new '-o posix'
|
|
shell option on 2020-09-01:
|
|
1. 'set --posix' now works as the expected equivalent of 'set -o posix'.
|
|
2. As of 2020-09-18, the posix option turns off braceexpand and turns on
|
|
letoctal. Any attempt to override that in a single command such as
|
|
'set -o posix +o letoctal' was quietly ignored. This now works as long
|
|
as the overriding option follows the posix option on the command line.
|
|
3. The --default option to 'set' now stops the 'posix' option, if set or
|
|
unset in the same 'set' command, from changing other options. This allows
|
|
the command output by 'set +o' to correctly restore the current options.
|
|
|
|
2021-02-11:
|
|
|
|
- Fixed a bug that caused ksh to lose track of all running background jobs if
|
|
a shared-state command substitution of the form v=${ cmd; } was used twice.
|
|
|
|
- Job control (the -m/-o monitor option) has been fixed for scripts. Background
|
|
jobs are now correctly assigned their own process group when run from
|
|
subshells (except command substitutions). The 'fg' command now also works for
|
|
scripts as it does on other shells, though 'wait' should be preferred.
|
|
|
|
2021-02-05:
|
|
|
|
- Fixed a longstanding bug that caused redirections that store a file
|
|
descriptor > 10 in a variable, such as {var}>file, to stop working if
|
|
brace expansion (the -B or -o braceexpand option) was turned off. (Note
|
|
that '{var}' is not a brace expansion as it does not contain ',' or '..'.)
|
|
|
|
2021-02-04:
|
|
|
|
- Fixed ksh crashing if an autoloaded function tried to autoload itself.
|
|
ksh now errors out gracefully with an "autoload loop" error message.
|
|
|
|
- Fixed crash on trying a very long nonexistent command.
|
|
|
|
2021-02-01:
|
|
|
|
- Fixed a bug in 'typeset': the '-s' modifier option for short integer will
|
|
now only be applied if the integer option '-i' is also present, avoiding
|
|
inconsistent results and a crash.
|
|
|
|
- Fixed: scalar arrays (-a) and associative arrays (-A) of a type created by
|
|
'enum' allowed values not specified by the enum type, corrupting results.
|
|
|
|
- Fixed: the "${array[@]}" expansion for associative arrays of a type created
|
|
by 'enum' expanded to random numbers instead of the array's values.
|
|
|
|
2021-01-30:
|
|
|
|
- The -x option to the 'command' built-in now causes it to bypass built-ins
|
|
so that it always runs/queries an external command. See 'command --man'.
|
|
|
|
- Fixed a bug in 'command -x' that caused the minimum exit status to be 1 if
|
|
a command with many arguments was divided into several command invocations.
|
|
|
|
- The 2020-08-16 fix is improved with a compile-time feature test that
|
|
detects if the OS requires extra bytes per argument in the arguments list,
|
|
maximising the efficiency of 'command -x' for the system it runs on.
|
|
|
|
2021-01-24:
|
|
|
|
- Fixed a bug in 'typeset': combining the -u option with -F or -E caused the
|
|
variable to become a hexadecimal floating point in error.
|
|
|
|
- Fixed: an unquoted variable expansion evaluated in a DEBUG trap action caused
|
|
IFS field splitting to be deactivated in code executed after the trap action.
|
|
This bug was introduced in ksh 93t+ 2009-11-30.
|
|
|
|
2021-01-23:
|
|
|
|
- Fixed: when the DEBUG trap was redefined in a subshell, the DEBUG trap in
|
|
the parent environment was corrupted or the shell crashed.
|
|
When a redirection was used in a DEBUG trap action, the trap was disabled.
|
|
DEBUG traps were also incorrectly inherited by subshells and ksh functions.
|
|
All this was caused by a bug introduced in ksh 93t 2008-07-25.
|
|
|
|
2021-01-22:
|
|
|
|
- Compile-time shell options can now be edited in src/cmd/ksh93/SHOPT.sh
|
|
before building.
|
|
|
|
2021-01-20:
|
|
|
|
- Fixed: executing a DEBUG trap in a command substitution had side effects
|
|
on the exit status ($?) of non-trap commands.
|
|
This bug was introduced in ksh 93t 2008-11-04.
|
|
|
|
- The typeset builtin command now gives an informative error message if an
|
|
incompatible combination of options is given.
|
|
|
|
2021-01-19:
|
|
|
|
- Fixed a crash when using 'cd' in a virtual/non-forking subshell in a
|
|
situation where the current working directory cannot be determined.
|
|
|
|
2021-01-08:
|
|
|
|
- Fixed a crash on exceeding the maximum size of the $PS1 prompt.
|
|
The maximum size is also increased from 160 to 256 bytes.
|
|
|
|
2021-01-07:
|
|
|
|
- Fixed a crash that could occur while ksh updated ${.sh.match}.
|
|
|
|
- Any changes to the hash table (a.k.a. "tracked aliases", i.e. cached $PATH
|
|
searches) in a subshell now no longer affect the parent shell's hash table.
|
|
|
|
2021-01-05:
|
|
|
|
- Fixed a bug in 'cd' that caused 'cd ./foo' to search for 'foo' in $CDPATH.
|
|
|
|
2021-01-03:
|
|
|
|
- The invocation
|
|
$ ksh +s
|
|
caused an infinite loop and corrupted ~/.sh_history. This is now fixed so
|
|
that the '-s' option is automatically turned on if there are no non-option
|
|
command arguments, as documented in Bolsky & Korn (1995), p. 261.
|
|
|
|
2020-10-22:
|
|
|
|
- Fixed: 'typeset -F0', 'typeset -E0', and 'typeset -X0' floating point
|
|
numerics having a precision of 0 with variable assignment.
|
|
'typeset -F0 x; x=4.56' worked but not 'typeset -F0 x=4.56'.
|
|
|
|
2020-10-21:
|
|
|
|
- Fixed: More concisely correct the exporting of uppercase and lowercase
|
|
variables when only the export and change case attributes were applied.
|
|
This fix improves upon the previous 2020-09-30 modifications.
|
|
|
|
2020-10-06:
|
|
|
|
- The security of virtual/non-forking subshells that locally change the present
|
|
working directory (PWD) using 'cd' has been improved in two ways.
|
|
1. On entering a subshell, if the parent shell's PWD proves inaccessible upon
|
|
saving it, the subshell will now fork into a separate process so the
|
|
parent process never changes its PWD, avoiding the need to restore it.
|
|
2. If some attack renders the parent shell's PWD unrestorable *after* ksh
|
|
enters a virtual subshell, ksh will now error out on exiting it, as
|
|
continuing would mean running arbitrary commands in the wrong PWD.
|
|
Hopefully this is an acceptable compromise between performance and security.
|
|
The proper fix would be to always fork a subshell when changing the working
|
|
directory within it, but the resulting slowdown would likely be unpopular.
|
|
|
|
2020-09-30:
|
|
|
|
- Fixed: 'typeset -xu' and 'typeset -xl' (export + change case) failed to
|
|
change the case of a variable's value in certain conditions.
|
|
|
|
- A ksh 93u+ regression was fixed in the combination of ERR trap handling and
|
|
the 'pipefail' option. A pipeline now triggers the ERR trap correctly again
|
|
if the 'pipefail' option is active and any of the pipeline elements return a
|
|
nonzero exit status. Similarly, if both the 'errexit' and 'pipefail' options
|
|
are active, ksh now correctly exits if any pipeline element returns nonzero.
|
|
|
|
- Autoloading a function no longer causes the calling script's $LINENO to be
|
|
off by the number of lines in the function definition file that was loaded.
|
|
This also corrects line numbers in warnings and error messages.
|
|
|
|
2020-09-28:
|
|
|
|
- While executing a ksh-style function, ksh 93u+ ignored all signals for which
|
|
the function had not set a local trap, except for SIGINT and SIGQUIT. This
|
|
was contrary to the manual, which states that a "trap condition that is not
|
|
caught or ignored by the function causes the function to terminate and the
|
|
condition to be passed on to the caller". This has now been fixed in 93u+m to
|
|
match the documentation, so that e.g. global traps work as expected again.
|
|
|
|
2020-09-27:
|
|
|
|
- The shell's lexical analysis of a 'case' statement within a do...done block
|
|
within a command substitution of the form $(...) has been fixed so that code
|
|
like the following no longer throws a spurious syntax error:
|
|
x=$(for i in 1; do case $i in word) true;; esac; done)
|
|
Previously, this required a leading parenthesis before 'word', although the
|
|
syntax error claimed that the ';;' was unexpected.
|
|
|
|
2020-09-26:
|
|
|
|
- 'whence -f' now completely ignores the existence of functions, as documented.
|
|
|
|
- ksh now does not import environment variables whose names are not valid in
|
|
the shell language, as it would be impossible to change or unset them.
|
|
However, they stay in the environment to be passed to child processes.
|
|
|
|
2020-09-25:
|
|
|
|
- whence -v/-a now reports the path to the file that an "undefined" (i.e.
|
|
autoloadable) function will be loaded from when invoked, if found in $FPATH.
|
|
|
|
- When ksh invoked a shell script that does not have a leading
|
|
#!/hashbang/path, 'ps' and /proc/<PID>/cmdline showed corrupted output if
|
|
the new script's command line was shorter than that of the invoking script.
|
|
This has been fixed by wiping the arguments buffer correctly.
|
|
|
|
2020-09-24:
|
|
|
|
- An omission made it impossible to turn off brace expansion within command
|
|
substitutions (`...`, $(...) or ${ ...; }) as the code for parsing these
|
|
did not check the -B/braceexpand option. This check has now been added.
|
|
|
|
2020-09-23:
|
|
|
|
- Fixed a crash that could occur when running a pipeline containing
|
|
backtick-style command substitutions with job control enabled.
|
|
|
|
- Fixed a crash that occurred when using 'typeset -u' or 'typeset -l' on a
|
|
special variable such as PATH, ENV or SHELL.
|
|
|
|
2020-09-21:
|
|
|
|
- A bug was fixed that caused command substitutions embedded in here-documents
|
|
to lose the output of the commands they ran. This bug occurred when ksh was
|
|
compiled with the SHOPT_SPAWN compile-time option.
|
|
|
|
- Bugfix: var=$(< file) now reads the file even if the standard inout, standard
|
|
output and/or standard error file descriptors are closed.
|
|
|
|
2020-09-20:
|
|
|
|
- Bugfix: when whence -v/-a found an "undefined" (i.e. autoloadable) function
|
|
in $FPATH, it actually loaded the function as a side effect of reporting on
|
|
its existence. Now it only reports, as documented.
|
|
|
|
- 'whence' will now canonicalise paths properly, resolving '.' and '..'
|
|
elements in paths given to it. It also no longer prefixes a spurious
|
|
double slash when doing something like 'cd / && whence bin/echo'.
|
|
|
|
2020-09-18:
|
|
|
|
- Setting the 'posix' option now turns off the 'braceexpand' option, as brace
|
|
expansion is not specified by POSIX and potentially incompatible with sh
|
|
scripts. In addition, 'set -o posix' now turns on the 'letoctal' option
|
|
instead of controlling that behaviour directly. 'set +o posix' does the
|
|
reverse of these.
|
|
|
|
2020-09-17:
|
|
|
|
- In the vi and emacs line editors, repeat count parameters can now also be
|
|
used for the arrow keys and the forward-delete key. E.g., in emacs mode,
|
|
<ESC> 7 <left-arrow> will now move the cursor seven positions to the left.
|
|
In vi control mode, this would be entered as: 7 <left-arrow>.
|
|
|
|
- When a background job on an interactive shell received SIGINT or SIGPIPE, the
|
|
job termination message was empty. It now shows "Interrupt" or "Broken Pipe".
|
|
|
|
- The -m (-o monitor) option is no longer ignored when specified on the shell
|
|
invocation command line.
|
|
|
|
- A script that is interrupted with Ctrl+C now terminates its background jobs
|
|
as expected, unless the -m (-o monitor) option was turned on.
|
|
|
|
2020-09-14:
|
|
|
|
- Corrected rounding of floating point values by ksh's printf %f formatting
|
|
operator. Fix contributed by @hyenias.
|
|
|
|
- The forward-delete key now works as expected in emacs and vi editing modes.
|
|
|
|
2020-09-11:
|
|
|
|
- The 'command' regular builtin utility (which runs a simple command, removing
|
|
special properties) has been made fully POSIX compliant.
|
|
1. The 'command' name can now result from an expansion (fixing BUG_CMDEXPAN),
|
|
e.g. 'c=command; "$c" ls' and 'set -- command ls; "$@"' now work.
|
|
2. If and only if the POSIX mode (the new -o posix shell option) is active,
|
|
then the 'command' utility now disables not only "special" but also
|
|
"declaration" properties of builtin commands that it invokes, meaning:
|
|
a. arguments that start with a variable name followed by '=' are
|
|
always treated as regular words subject to normal shell syntax;
|
|
b. 'command' can now stop the shell from exiting if a command that it
|
|
invokes tries to modify a readonly variable (fixing BUG_CMDSPEXIT).
|
|
|
|
- The 'history' (== 'hist -l') and 'r' (== 'hist -s') interactive shell
|
|
history commands have reverted to preset aliases and are now only loaded if
|
|
the shell is interactive and not initialised in POSIX mode. This avoids
|
|
unneeded conflicts with external commands by these names, particularly 'r'.
|
|
|
|
2020-09-09:
|
|
|
|
- Fixed BUG_LOOPRET2 and related bugs. The 'exit' and 'return' commands without
|
|
an argument now correctly default to passing down the exit status of the
|
|
last-run command. Tests like the following, in which the last-run command is
|
|
'false', now correctly output 1 instead of 0:
|
|
fn() { return || true; }; false; fn; echo "$?"
|
|
fn() { while return; do true; done; }; false; fn; echo "$?"
|
|
fn() { for i in 1; do return; done; }; false; fn; echo "$?"
|
|
fn() { case 1 in 1) return ;; esac; }; false; fn; echo "$?"
|
|
fn() { { return; } 2>&1; }; false; fn; echo "$?"
|
|
|
|
2020-09-05:
|
|
|
|
- Fixed erroneous syntax errors in parameter expansions such as ${var:-wor)d}
|
|
or ${var+w(ord}. The parentheses now correctly lose their normal grammatical
|
|
meaning within the braces. Fix by Eric Scrivner backported from ksh2020.
|
|
|
|
2020-09-04:
|
|
|
|
- Fixed a bug that caused a syntax error to be thrown if the special parameter
|
|
expansions ${!} and ${$} (including braces) were used within a here-document.
|
|
Bug reported by @Saikiran-m on GitHub.
|
|
|
|
2020-09-01:
|
|
|
|
- The bash-style '&>file' redirection shorthand (for '>file 2>&1') is now
|
|
always recognised and not only when running rc/profile init scripts. It no
|
|
longer issues a warning. This brings ksh93 in line with mksh, bash and zsh.
|
|
|
|
- A long-form shell option '-o posix' has been added, which implements a
|
|
mode for better compatibility with the POSIX standard. It is automatically
|
|
turned on if ksh is invoked under the name 'sh'.
|
|
For now, it:
|
|
* disables the &> redirection shorthand
|
|
* causes the 'let' arithmetic command to recognise octal numbers by
|
|
leading zeros regardless of the setting of the 'letoctal' option
|
|
* causes file descriptors > 2 to be left open when invoking another program
|
|
* makes the <> redirection operator default to stdin instead of stdout
|
|
(this keeps the 2020-05-13 BUG_REDIRIO fix for the POSIX mode while
|
|
restoring traditional ksh93 behaviour for backwards compatibility)
|
|
* disables a noncompliant 'test -t' == 'test -t 1' compatibility hack
|
|
* disables passing an exported variable's attributes (such as integer or
|
|
readonly) to a new ksh process through the environment
|
|
|
|
2020-08-19:
|
|
|
|
- Sped up the 'read' command on most systems by 15-25%. Fixed a hanging bug
|
|
on reading from a FIFO that could occur on macOS.
|
|
|
|
2020-08-17:
|
|
|
|
- 'command -p' incorrectly used the hash table entry (a.k.a. tracked alias)
|
|
for a command if its path was previously hashed. It has now been fixed so
|
|
it never consults the hash table.
|
|
|
|
2020-08-16:
|
|
|
|
- Fixed 'command -x' on macOS, Linux and Solaris by accounting for a 16-byte
|
|
argument alignment. If execution does fail, it now aborts with an internal
|
|
error message instead of entering an infinite retry loop.
|
|
|
|
2020-08-13:
|
|
|
|
- Fixed memory leaks and a crashing bug that occurred when defining and
|
|
running functions in subshells.
|
|
|
|
2020-08-11:
|
|
|
|
- Fixed an intermittent crash upon running a large number of subshells.
|
|
|
|
2020-08-10:
|
|
|
|
- A number of fixes have been applied to the printf formatting directives
|
|
%H and %#H (as well as the undocumented equivalents %(html)q and %(url)q):
|
|
1. Both formatters have been made multibyte/UTF-8 aware, and no longer
|
|
delete multibyte characters. Invalid UTF-8 byte sequences are rendered
|
|
as ASCII question marks.
|
|
2. %H no longer wrongly changes spaces to non-breaking spaces ( ).
|
|
3. %H now converts the single quote (') to '%#39;' instead of '''
|
|
which is not a valid entity in all HTML versions.
|
|
4. %#H failed to encode some reserved characters (e.g. '?') while encoding
|
|
some unreserved ones (e.g. '~'). It now percent-encodes all characters
|
|
except those 'unreserved' as per RFC3986 (ASCII alphanumeric plus -._~).
|
|
|
|
- Fixed a crash that occurred intermittently after running an external
|
|
command from a command substitution expanded from the $PS1 shell prompt.
|
|
|
|
2020-08-09:
|
|
|
|
- File name generation (a.k.a. pathname expansion, a.k.a. globbing) now
|
|
never matches the special navigational names '.' (current directory) and
|
|
'..' (parent directory). This change makes a pattern like .* useful; it
|
|
now matches all hidden files (dotfiles) in the current directory, without
|
|
the harmful inclusion of '.' and '..'.
|
|
|
|
2020-08-08:
|
|
|
|
- Argument checking in the 'redirect' builtin command (see 2020-06-11) has
|
|
been improved to error out before executing redirections. For example, an
|
|
error like 'redirect ls >foo.txt' now will not create 'foo.txt' and will
|
|
not leave your standard output permanently redirected to it.
|
|
|
|
2020-08-06:
|
|
|
|
- Added the '${.sh.pid}' variable as an alternative to Bash's '$BASHPID'.
|
|
This variable is set to the current shell's PID, unlike '$$' (which is
|
|
set to the parent shell's PID). In virtual subshells '${.sh.pid}' is not
|
|
changed from its previous value, while in forked subshells '${.sh.pid}'
|
|
is set to the subshell's process ID.
|
|
|
|
2020-08-05:
|
|
|
|
- Fixed a bug in functions that caused ksh to crash when an array with an
|
|
unset method was turned into a multidimensional array.
|
|
|
|
- Fixed a bug that caused scripts to continue running after over-shifting
|
|
in a function when the function call had a redirection.
|
|
|
|
- When generating shellquoted strings (such as with 'printf %q'), the
|
|
hexadecimal value of a quoted unprintable character was not protected with
|
|
square braces, e.g. 0x12 followed by '3' would be quoted as '\x123', which
|
|
is a different value. Such strings are now quoted like '\x[12]3' if the
|
|
next character is a hexadecimal digit.
|
|
|
|
2020-07-31:
|
|
|
|
- Fixed a bug that caused multidimensional associative arrays to be created
|
|
with an extra array member.
|
|
|
|
- Fixed a bug that caused the expansions of positional parameters $1 - $9,
|
|
as well as special parameters such as $? and $-, to corrupt any multibyte
|
|
characters immediately following the expansion if a UTF-8 locale is active.
|
|
|
|
2020-07-29:
|
|
|
|
- On a ksh compiled to use fork(2) to run external commands, a bug has been
|
|
fixed that caused signals (such as SIGINT, Ctrl+C) to be ignored within a
|
|
non-forked subshell after running an external command within that subshell.
|
|
|
|
2020-07-25:
|
|
|
|
- Fixed BUG_MULTIBIFS: Multibyte characters can now be used as IFS
|
|
delimiters. "$*" was incorrectly joining positional parameters on
|
|
the first byte of a multibyte character. This was due to truncation
|
|
based on the incorrect assumption the IFS would never be larger
|
|
than a single byte.
|
|
|
|
- Fixed a bug that caused the sleep builtin to continue after being given
|
|
an unrecognized option. 'sleep -: 1' will now show a usage message and
|
|
exit instead of sleep for one second.
|
|
|
|
- Fixed a bug that caused the 'typeset' variable attributes -a, -A, -l, and
|
|
-u to leak out of a subshell if they were set without assigning a value.
|
|
|
|
2020-07-23:
|
|
|
|
- Fixed an infinite loop that could occur when ksh is the system's /bin/sh.
|
|
|
|
- A command substitution that is run on the same line as a here-document
|
|
will no longer cause a syntax error.
|
|
|
|
2020-07-22:
|
|
|
|
- Fixed two race conditions when running external commands on
|
|
interactive shells with job control active.
|
|
|
|
2020-07-20:
|
|
|
|
- If a shell function and a built-in command by the same name exist,
|
|
'whence -a' and 'type -a' now report both.
|
|
|
|
- Fixed a bug that caused file descriptors opened with 'redirect' or 'exec'
|
|
to survive a subshell environment after exiting it.
|
|
|
|
2020-07-19:
|
|
|
|
- Fixed a crash that occurred in the '.' command when using kshdb.
|
|
|
|
- Fixed a crash that occurred when attempting to use redirection with an
|
|
invalid file descriptor.
|
|
|
|
2020-07-16:
|
|
|
|
- The 'history' and 'r' default aliases have been made regular built-ins,
|
|
leaving zero default aliases.
|
|
|
|
- Fixed a bug that caused 'sleep -s' to have no effect with intervals longer
|
|
than 30 seconds.
|
|
|
|
- The accuracy of the sleep builtin has been improved. It no longer ignores
|
|
microseconds and doesn't add extra milliseconds when the interval is less
|
|
than 31 seconds.
|
|
|
|
2020-07-15:
|
|
|
|
- The 'autoload', 'compound', 'float', 'functions', 'integer' and 'nameref'
|
|
default aliases have been converted into regular built-in commands, so
|
|
that 'unalias -a' does not remove them. Shell functions can now use
|
|
these names, which improves compatibility with POSIX shell scripts.
|
|
|
|
- The End key escape sequence '^[[F' is now handled in the emacs and vi editing
|
|
modes. The End key moves the cursor to the end of the line (in contrast to
|
|
the Home key doing the opposite).
|
|
|
|
2020-07-14:
|
|
|
|
- Fixed a bug that caused 'set -b' to have no effect.
|
|
|
|
- Following the 'time' keyword, the 'times' builtin command now also
|
|
supports millisecond precision.
|
|
|
|
2020-07-13:
|
|
|
|
- Fixed a fork bomb that could occur when the vi editor was sent SIGTSTP
|
|
while running in a ksh script.
|
|
|
|
- Appending a lone percent to the end of a format specifier no longer
|
|
causes a syntax error. The extra percent will be treated as a literal
|
|
'%', like in Bash and zsh.
|
|
|
|
- The 'time' keyword now has proper support for millisecond precision.
|
|
Although this feature was previously documented, the 'time' keyword
|
|
only supported up to centisecond precision, which caused a command
|
|
like the one below to return '0.000' on certain operating systems:
|
|
$ TIMEFORMAT='%3R'; time sleep .003
|
|
|
|
- The 'time' keyword now zero-pads seconds less than ten (like mksh).
|
|
|
|
2020-07-10:
|
|
|
|
- Fixed a bug that caused types created with 'typeset -T' to throw an error
|
|
when used if the type name started with a lowercase 'a'.
|
|
|
|
- A potential crash due to memory corruption when using many file
|
|
descriptors has been fixed.
|
|
|
|
2020-07-09:
|
|
|
|
- Fixed a crash on syntax error when sourcing/dotting multiple files.
|
|
|
|
- Fixed a crash when listing indexed arrays.
|
|
|
|
- Fixed a memory leak when restoring PATH when temporarily setting PATH
|
|
for a command (e.g. PATH=/foo/bar command ...) or in a virtual subshell.
|
|
|
|
- Combining ((...)) with redirections no longer causes a syntax error
|
|
due to the parser handling '>' incorrectly.
|
|
|
|
- Fixed a bug that corrupted KIA/CQL cross-reference databases created using
|
|
ksh's -R option; shell warnings were wrongly included in the database file.
|
|
|
|
- The shell's quoting algorithm (used in xtrace, printf %q, and more) has been
|
|
fixed for UTF-8 (Unicode) locales; it no longer needlessly and inconsistently
|
|
encodes normal printable UTF-8 characters into hexadecimal \u[xxxx] codes.
|
|
|
|
2020-07-07:
|
|
|
|
- Four of the date formats accepted by 'printf %()T' have had their
|
|
functionality altered to the common behavior of date(1):
|
|
- '%k' and '%l' print the current hour with blank padding, the former
|
|
based on a 24-hour clock and the latter a twelve hour clock. These
|
|
are common extensions present on Linux and *BSD.
|
|
- '%f' prints a date with the format string '%Y.%m.%d-%H:%M:%S' (BusyBox).
|
|
- '%q' prints the quarter of the year (GNU).
|
|
|
|
2020-07-06:
|
|
|
|
- 'notty' is now written to the ksh auditing file instead of '(null)' if
|
|
the user's tty could not be determined.
|
|
|
|
- Unsetting an associative array no longer causes a memory leak to occur.
|
|
|
|
2020-07-05:
|
|
|
|
- In UTF-8 locales, fix corruption of the shell's internal string quoting
|
|
algorithm (as used by xtrace, 'printf %q', and more) that occurred when
|
|
the processing of a multibyte character was interrupted.
|
|
|
|
2020-07-03:
|
|
|
|
- Backslashes are no longer escaped in the raw Bourne Shell-like editing
|
|
mode in multibyte locales, i.e. backslashes are no longer treated like
|
|
Control-V if the emacs and vi modes are disabled.
|
|
|
|
- Deleting a backslash in vi mode with Control-H or Backspace now only
|
|
escapes a backslash if it was the previous input. This means erasing a
|
|
string such as 'ab\\\' will only cause the first backslash to escape a
|
|
Backspace as '^?', like in emacs mode.
|
|
|
|
- An odd interaction with Backspace when the last character of a separate
|
|
buffer created with Shift-C was '\' has been fixed. '^?' will no longer
|
|
be output repeatedly when attempting to erase a separate buffer with
|
|
a Backspace. Note that buffers created with Shift-C are not meant to be
|
|
erasable:
|
|
https://pubs.opengroup.org/onlinepubs/9699919799/utilities/vi.html#tag_20_152_13_49
|
|
|
|
- The 'kill' builtin now supports the SIGINFO signal (on operating systems
|
|
with support for SIGINFO).
|
|
|
|
2020-07-02:
|
|
|
|
- Fixed a crash that occurred if a directory named '.paths' existed in any
|
|
directory listed in $PATH. The fix was to only read '.paths' if it is a
|
|
regular file or a symlink to a regular file.
|
|
|
|
2020-06-30:
|
|
|
|
- 'read -u' will no longer crash with a memory fault when given an out of
|
|
range or negative file descriptor.
|
|
|
|
- The '=~' operator no longer raises an error if a regular expression
|
|
combines the '{x}' quantifier with a sub-expression.
|
|
|
|
2020-06-28:
|
|
|
|
- Variables created with 'typeset -RF' no longer cause a memory fault
|
|
when accessed.
|
|
|
|
- Unsetting an array that was turned into a compound variable will no
|
|
longer cause silent memory corruption.
|
|
|
|
- Variables created with 'readonly' in functions are now set to the
|
|
specified value instead of nothing. Note that 'readonly' does not
|
|
create a function-local scope, unlike 'typeset -r' which does.
|
|
|
|
2020-06-26:
|
|
|
|
- Changing to a directory that has a name starting with a '.' will no
|
|
longer fail if preceded by '../' (i.e. 'cd ../.local' will now work).
|
|
|
|
2020-06-24:
|
|
|
|
- Fixed buggy tab completion of tilde-expanded paths such as
|
|
~/some in 'vi' mode.
|
|
|
|
- In the raw/default Bourne Shell-like editing mode that occurs when neither
|
|
the 'emacs' nor the 'vi' shell option is active:
|
|
* tab completion is now correctly disabled, instead of enabled and broken;
|
|
* entering tab characters now moves the cursor the correct amount.
|
|
|
|
2020-06-23:
|
|
|
|
- Fixed a bug that caused combining process substitution with redirection
|
|
to create a bizarre file in the user's current working directory.
|
|
|
|
- Using process substitution while the shell is interactive no longer
|
|
causes the process ID of the asynchronous process to be printed.
|
|
|
|
2020-06-22:
|
|
|
|
- The 'stop' and 'suspend' default aliases have been converted into regular
|
|
built-in commands, so that 'unalias -a' does not remove them, 'suspend'
|
|
can do a couple of sanity checks, and something like
|
|
cmd=stop; $cmd $!
|
|
will now work. See 'stop --man' and 'suspend --man' for more information.
|
|
|
|
- Fixed a bug that caused the kill and stop commands to segfault when given
|
|
a non-existent job.
|
|
|
|
- Nested functions no longer ignore variable assignments that were prefixed
|
|
to their parent function, i.e. 'VAR=foo func' will now set $VAR to 'foo'
|
|
in the scope of any nested function 'func' runs.
|
|
|
|
2020-06-20:
|
|
|
|
- Fixed a bug that caused setting the following variables as readonly in
|
|
a virtual subshell to affect the environment outside of the subshell:
|
|
$_
|
|
${.sh.name}
|
|
${.sh.subscript}
|
|
${.sh.level}
|
|
$RANDOM
|
|
$LINENO
|
|
|
|
- Fixed two bugs that caused 'unset .sh.lineno' to always produce a memory
|
|
fault and '(unset .sh.level)' to memory fault when run in nested
|
|
functions.
|
|
|
|
2020-06-18:
|
|
|
|
- A two decade old bug that caused 'whence -a' to base the path of
|
|
tracked aliases on the user's current working directory has been
|
|
fixed. Now the real path to tracked aliases is shown when '-a' is
|
|
passed to the whence command.
|
|
|
|
2020-06-17:
|
|
|
|
- A bug in 'unset -f' was fixed that prevented shell functions from
|
|
unsetting themselves while they were running. A POSIX function no longer
|
|
crashes when doing so, and a KornShell-style function no longer silently
|
|
ignores an 'unset -f' on itself. A function of either form now continues
|
|
running after unsetting itself, and is removed at the end of the run.
|
|
|
|
2020-06-16:
|
|
|
|
- Passing the '-d' flag to the read builtin will no longer cause the '-r'
|
|
flag to be discarded when 'read -r -d' is run.
|
|
|
|
- Fix BUG_CMDSPASGN: preceding a "special builtin"[*] with 'command' now
|
|
prevents preceding invocation-local variable assignments from becoming global.
|
|
[*] https://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_14
|
|
|
|
2020-06-15:
|
|
|
|
- The 'source' alias has been converted into a regular built-in command.
|
|
|
|
- Functions that set variables in a virtual subshell will no longer affect
|
|
variables of the same name outside of the virtual subshell's environment.
|
|
|
|
- Terse usage messages written by builtin commands now point the user to
|
|
the --help and --man options for more information.
|
|
|
|
2020-06-14:
|
|
|
|
- 'read -S' is now able to correctly handle strings with double quotes
|
|
nested inside of double quotes.
|
|
|
|
2020-06-13:
|
|
|
|
- Fixed a timezone name determination bug on FreeBSD that caused the
|
|
output from "LC_ALL=C printf '%T\n' now" to print the wrong time zone name.
|
|
|
|
2020-06-11:
|
|
|
|
- Fixed a bug that caused running 'builtin -d' on a special builtin to
|
|
delete it. The man page for the 'builtin' command documents that special
|
|
builtins cannot be deleted.
|
|
|
|
- POSIX compliance fix: It is now possible to set shell functions named
|
|
'alias' or 'unalias', overriding the commands by the same names. In
|
|
technical terms, they are now regular builtins, not special builtins.
|
|
|
|
- The redirect='command exec' alias has been converted to a regular
|
|
'redirect' builtin command that only accepts I/O redirections, which
|
|
persist as in 'exec'. This means that:
|
|
* 'unlias -a' no longer removes the 'redirect' command;
|
|
* users no longer accidentally get logged out of their shells if
|
|
they type something intuitive but wrong, like 'redirect ls >file'.
|
|
|
|
- The undocumented 'login' and 'newgrp' builtin commands have been removed.
|
|
These replaced your shell session with the external commands by the same
|
|
name, as in 'exec'. If an error occurred (e.g. due to a typo), you would
|
|
end up immediately logged out.
|
|
If you do want this behaviour, you can restore it by setting:
|
|
alias login='exec login'
|
|
alias newgrp='exec newgrp'
|
|
|
|
2020-06-10:
|
|
|
|
- The 'hash' utility is now a regular builtin instead of an alias to
|
|
'alias -t --'. The functionality of the old command has been removed
|
|
from the alias builtin.
|
|
|
|
- 'set +r' is no longer able to unset the restricted option. This change
|
|
makes the behavior of 'set +r' identical to 'set +o restricted'.
|
|
|
|
2020-06-09:
|
|
|
|
- The 'unalias' builtin will now return a non-zero status if it tries
|
|
to remove a previously set alias that is not currently set.
|
|
|
|
2020-06-08:
|
|
|
|
- Fix an issue with the up arrow key in Emacs editing mode.
|
|
Emacs editing mode is bugged in ksh93u+ and ksh2020. Let's
|
|
say you were to run the following commands after starting
|
|
a fresh instance of ksh:
|
|
$ alias foo=true
|
|
$ unalias foo
|
|
If you type 'a' and then press the up arrow on your keyboard,
|
|
ksh will complete 'a' to 'alias foo=true' by doing a reverse
|
|
search for the last command that starts with 'a'.
|
|
Run the alias command again, then type 'u' and press the up
|
|
arrow key again. If ksh is in Vi mode, you will get 'unalias foo',
|
|
but in Emacs mode you will get 'alias foo=true' again.
|
|
All subsequent commands were ignored as ksh was saving the first
|
|
command and only based later searches off of it.
|
|
|
|
- If 'set -u'/'set -o nounset' is active, then the shell now errors out if a
|
|
nonexistent positional parameter such as $1, $2, ... is accessed, as other
|
|
shells do and POSIX requires. (This does *not* apply to "$@" and "$*".)
|
|
|
|
- If 'set -u'/'set -o nounset' is active, then the shell now errors out if $!
|
|
is accessed before the shell has launched any background process.
|
|
|
|
- Removed support for an obscure early 1990s Bell Labs file system research
|
|
project called 3DFS, which has not existed for decades. This removes:
|
|
- an obnoxious default alias 2d='set -f;_2d' that turned off your file name
|
|
wildcard expansion and then tried to run a nonexistent '_2d' command
|
|
- undocumented builtins 'vmap' and 'vpath' that only printed error messages
|
|
- a non-functional -V unary operator for the test and [[ commands
|
|
|
|
- If the last program run by a ksh script exits with a signal (e.g. crashed),
|
|
ksh itself now exits normally instead of repeating that same signal.
|
|
In addition, using 'exit x' for x > 256 no longer makes ksh issue a signal.
|
|
|
|
2020-06-06:
|
|
|
|
- The 'times' command is now a builtin command that conforms to POSIX
|
|
instead of an alias for the 'time' command. It displays the accumulated
|
|
user and system CPU times, one line with the times used by the shell and
|
|
another with those used by all of the shell's child processes.
|
|
https://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_27
|
|
|
|
- The default aliases command='command ' and nohup='nohup ' have been
|
|
removed because they caused breakage in an attempt to circumvent other
|
|
breakage which is being fixed. In the unlikely even that anyone still
|
|
needs alias substitution to continue on the command argument following
|
|
'command' or 'nohup', it's easy to set these aliases yourself.
|
|
|
|
2020-06-05:
|
|
|
|
- Fix a bug that caused special variables such as PATH, LANG, LC_ALL,
|
|
etc. to lose their effect after being unset in a subshell. For example:
|
|
(unset PATH; PATH=/dev/null; ls); : wrongly ran 'ls'
|
|
(unset LC_ALL; LC_ALL=badlocale); : failed to print a diagnostic
|
|
This also fixes BUG_KUNSETIFS: unsetting IFS in a subshell failed if IFS
|
|
was set to the empty value in the parent shell.
|
|
|
|
- Fix crashes on some systems, including at least a crash in 'print -v' on
|
|
macOS, by eliminating an invalid/undefined use of memccpy() on overlapping
|
|
buffers in the commonly used sfputr() function.
|
|
|
|
- Fix the ${.sh.subshell} level counter; it is no longer reset to zero when a
|
|
non-forked subshell happens to fork into a separate process for some reason
|
|
(an internal implementation detail that should be unnoticeable to scripts).
|
|
|
|
2020-06-04:
|
|
|
|
- Fix BUG_KBGPID: the $! special parameter was not set if a background job
|
|
(somecommand &) or co-process (somecommand |&) was launched as the only
|
|
command within a braces block with an attached redirection, for example:
|
|
{
|
|
somecommand &
|
|
} >&2
|
|
With the bug, $! was unchanged; now it contains the PID of somecommand.
|
|
|
|
2020-05-31:
|
|
|
|
- Fix a bug in autoloading functions. Directories in the path search list
|
|
which should be skipped (e.g. because they don't exist) did not interact
|
|
correctly with autoloaded functions, so that a function to autoload was
|
|
not always found correctly.
|
|
Details: https://github.com/att/ast/issues/1454
|
|
|
|
2020-05-30:
|
|
|
|
- Fix POSIX compliance of 'test'/'[' exit status on error. The command now
|
|
returns status 2 instead of 1 when given an invalid number or arithmetic
|
|
expression, e.g.:
|
|
[ 123 -eq 123x ]; echo $?
|
|
now outputs 2 instead of 1.
|
|
|
|
2020-05-29:
|
|
|
|
- Fix BUG_FNSUBSH: functions can now be correctly redefined and unset in
|
|
subshell environments (such as ( ... ), $(command substitutions), etc).
|
|
Before this fix, this was silently ignored, causing the function by the
|
|
same name from the parent shell environment to be executed instead.
|
|
fn() { echo mainsh; }
|
|
(fn() { echo subsh; }; fn); fn
|
|
This now correctly outputs "subsh mainsh" instead of "mainsh mainsh".
|
|
ls() { echo "ls executed"; }
|
|
(unset -f ls; ls); ls
|
|
This now correctly lists your directory and then prints "ls executed",
|
|
instead of printing "ls executed" twice.
|
|
|
|
- Fix a similar bug with aliases. These can now be correctly unset
|
|
in subshell environments.
|
|
|
|
2020-05-21:
|
|
|
|
- Fix truncating of files with the combined redirections '<>;file' and
|
|
'<#pattern'. The bug was caused by out-of-sync streams.
|
|
Details and discussion: https://github.com/att/ast/issues/61
|
|
|
|
- Patched code injection vulnerability CVE-2019-14868. As a result, you can
|
|
no longer use expressions in imported numeric environment variables; only
|
|
integer literals are allowed.
|
|
|
|
2020-05-20:
|
|
|
|
- Fix BUG_ISSETLOOP. Expansions like ${var+set} remained static when used
|
|
within a 'for', 'while' or 'until' loop; the expansions din't change along
|
|
with the state of the variable, so they could not be used to check whether a
|
|
variable is set within a loop if the state of that variable changed in the
|
|
course of the loop.
|
|
|
|
- Fix BUG_IFSISSET. ${IFS+s} always yielded 's', and [[ -v IFS ]] always
|
|
yielded true, even if IFS is unset. This applied to IFS only.
|
|
|
|
2020-05-19:
|
|
|
|
- Fix 'command -p'. The -p option causes the operating system's standard
|
|
utilities path (as output by 'getconf PATH') to be searched instead of $PATH.
|
|
Before this fix, this was broken on non-interactive shells as the internal
|
|
variable holding the default PATH value was not correctly initialised.
|
|
|
|
2020-05-16:
|
|
|
|
- Fix 'test -t 1', '[ -t 1 ]', '[[ -t 1 ]]' in command substitutions.
|
|
Standard output (file descriptor 1) tested as being on a terminal within a
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|
command substitution, which makes no sense as the command substitution is
|
|
supposed to be catching standard output.
|
|
v=$(echo begincomsub
|
|
[ -t 1 ] && echo oops
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|
echo endcomsub)
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|
echo "$v"
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|
This now does not output "oops".
|
|
|
|
2020-05-14:
|
|
|
|
- Fix syncing history when print -s -f is used. For example, the
|
|
following now correctly adds a 'cd' command to the history:
|
|
print -s -f 'cd -- %q\n' "$PWD"
|
|
Ref.: https://github.com/att/ast/issues/425
|
|
https://github.com/att/ast/pull/442
|
|
|
|
- Fix BUG_PUTIOERR: Output builtins now correctly detect
|
|
input/output errors. This allows scripts to check for a nonzero exit
|
|
status on the 'print', 'printf' and 'echo' builtins and prevent possible
|
|
infinite loops if SIGPIPE is ignored.
|
|
|
|
- Add a convenient bin/run_ksh_tests script to the source tree that
|
|
sets up the necessary environment and runs the ksh regression tests.
|
|
|
|
2020-05-13:
|
|
|
|
- Fix BUG_CASELIT: an undocumented 'case' pattern matching misbehaviour that
|
|
goes back to the original Bourne shell, but wasn't discovered until 2018.
|
|
If a pattern doesn't match as a pattern, it was tried again as a literal
|
|
string. This broke common validation use cases, e.g.:
|
|
n='[0-9]'
|
|
case $n in
|
|
( [0-9] ) echo "$n is a number" ;;
|
|
esac
|
|
would output "[0-9] is a number" as the literal string fallback matches the
|
|
pattern. As this misbehaviour was never documented anywhere (not for Bourne,
|
|
ksh88, or ksh93), and it was never replicated in other shells (not even in
|
|
ksh88 clones pdksh and mksh), it is unlikely any scripts rely on it.
|
|
Of course, a literal string fallback, should it be needed, is trivial to
|
|
implement correctly without this breakage:
|
|
case $n in
|
|
( [0-9] | "[0-9]") echo "$n is a number or the number pattern" ;;
|
|
esac
|
|
Ref.: https://github.com/att/ast/issues/476
|
|
|
|
- Fix BUG_REDIRIO: ksh used to redirect standard output by default when no
|
|
file descriptor was specified with the rarely used '<>' reading/writing
|
|
redirection operator. It now redirects standard input by default, as POSIX
|
|
specifies and as all other POSIX shells do. To redirect standard output
|
|
for reading and writing, you now need '1<>'.
|
|
Ref.: https://github.com/att/ast/issues/75
|
|
http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_07_07
|