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1de20d65a8
Original report and info: https://www.mail-archive.com/ast-developers@lists.research.att.com/msg01677.html https://www.mail-archive.com/ast-developers@lists.research.att.com/msg01679.html Patch pulled in from: https://raw.githubusercontent.com/oracle/solaris-userland/master/components/ksh93/patches/195-17824699.patch src/cmd/ksh93/edit/edit.c: ed_setup(): - Prevent the ed_setup() function from writing past ep->e_prompt, which is set to the local char prompt[PRSIZE] variable in ed_emacsread(). src/cmd/ksh93/include/edit.h: - Increase maximum prompt size, PRSIZE, to 256.
844 lines
34 KiB
Text
844 lines
34 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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2021-01-08:
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- Fixed a crash on exceeding the maximum size of the $PS1 prompt.
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The maximum size is also increased from 160 to 256 bytes.
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2021-01-07:
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- Fixed a crash that could occur while ksh updated ${.sh.match}.
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- Any changes to the hash table (a.k.a. "tracked aliases", i.e. cached $PATH
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searches) in a subshell now no longer affect the parent shell's hash table.
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2021-01-05:
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- Fixed a bug in 'cd' that caused 'cd ./foo' to search for 'foo' in $CDPATH.
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2021-01-03:
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- The invocation
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$ ksh +s
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caused an infinite loop and corrupted ~/.sh_history. This is now fixed so
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that the '-s' option is automatically turned on if there are no non-option
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command arguments, as documented in Bolsky & Korn (1995), p. 261.
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2020-10-22:
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- Fixed: 'typeset -F0', 'typeset -E0', and 'typeset -X0' floating point
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numerics having a precision of 0 with variable assignment.
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'typeset -F0 x; x=4.56' worked but not 'typeset -F0 x=4.56'.
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2020-10-21:
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- Fixed: More concisely correct the exporting of uppercase and lowercase
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variables when only the export and change case attributes were applied.
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This fix improves upon the previous 2020-09-30 modifications.
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2020-10-06:
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- The security of virtual/non-forking subshells that locally change the present
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working directory (PWD) using 'cd' has been improved in two ways.
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1. On entering a subshell, if the parent shell's PWD proves inaccessible upon
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saving it, the subshell will now fork into a separate process so the
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parent process never changes its PWD, avoiding the need to restore it.
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2. If some attack renders the parent shell's PWD unrestorable *after* ksh
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enters a virtual subshell, ksh will now error out on exiting it, as
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continuing would mean running arbitrary commands in the wrong PWD.
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Hopefully this is an acceptable compromise between performance and security.
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The proper fix would be to always fork a subshell when changing the working
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directory within it, but the resulting slowdown would likely be unpopular.
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2020-09-30:
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- Fixed: 'typeset -xu' and 'typeset -xl' (export + change case) failed to
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change the case of a variable's value in certain conditions.
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- A ksh 93u+ regression was fixed in the combination of ERR trap handling and
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the 'pipefail' option. A pipeline now triggers the ERR trap correctly again
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if the 'pipefail' option is active and any of the pipeline elements return a
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nonzero exit status. Similarly, if both the 'errexit' and 'pipefail' options
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are active, ksh now correctly exits if any pipeline element returns nonzero.
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- Autoloading a function no longer causes the calling script's $LINENO to be
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off by the number of lines in the function definition file that was loaded.
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This also corrects line numbers in warnings and error messages.
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2020-09-28:
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- While executing a ksh-style function, ksh 93u+ ignored all signals for which
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the function had not set a local trap, except for SIGINT and SIGQUIT. This
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was contrary to the manual, which states that a "trap condition that is not
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caught or ignored by the function causes the function to terminate and the
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condition to be passed on to the caller". This has now been fixed in 93u+m to
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match the documentation, so that e.g. global traps work as expected again.
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2020-09-27:
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- The shell's lexical analysis of a 'case' statement within a do...done block
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within a command substitution of the form $(...) has been fixed so that code
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like the following no longer throws a spurious syntax error:
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x=$(for i in 1; do case $i in word) true;; esac; done)
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Previously, this required a leading parenthesis before 'word', although the
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syntax error claimed that the ';;' was unexpected.
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2020-09-26:
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- 'whence -f' now completely ignores the existence of functions, as documented.
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- ksh now does not import environment variables whose names are not valid in
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the shell language, as it would be impossible to change or unset them.
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However, they stay in the environment to be passed to child processes.
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2020-09-25:
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- whence -v/-a now reports the path to the file that an "undefined" (i.e.
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autoloadable) function will be loaded from when invoked, if found in $FPATH.
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- When ksh invoked a shell script that does not have a leading
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#!/hashbang/path, 'ps' and /proc/<PID>/cmdline showed corrupted output if
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the new script's command line was shorter than that of the invoking script.
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This has been fixed by wiping the arguments buffer correctly.
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2020-09-24:
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- An omission made it impossible to turn off brace expansion within command
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substitutions (`...`, $(...) or ${ ...; }) as the code for parsing these
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did not check the -B/braceexpand option. This check has now been added.
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2020-09-23:
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- Fixed a crash that could occur when running a pipeline containing
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backtick-style command substitutions with job control enabled.
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- Fixed a crash that occurred when using 'typeset -u' or 'typeset -l' on a
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special variable such as PATH, ENV or SHELL.
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2020-09-21:
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- A bug was fixed that caused command substitutions embedded in here-documents
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to lose the output of the commands they ran. This bug occurred when ksh was
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compiled with the SHOPT_SPAWN compile-time option.
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- Bugfix: var=$(< file) now reads the file even if the standard inout, standard
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output and/or standard error file descriptors are closed.
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2020-09-20:
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- Bugfix: when whence -v/-a found an "undefined" (i.e. autoloadable) function
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in $FPATH, it actually loaded the function as a side effect of reporting on
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its existence. Now it only reports, as documented.
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- 'whence' will now canonicalise paths properly, resolving '.' and '..'
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elements in paths given to it. It also no longer prefixes a spurious
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double slash when doing something like 'cd / && whence bin/echo'.
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2020-09-18:
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- Setting the 'posix' option now turns off the 'braceexpand' option, as brace
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expansion is not specified by POSIX and potentially incompatible with sh
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scripts. In addition, 'set -o posix' now turns on the 'letoctal' option
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instead of controlling that behaviour directly. 'set +o posix' does the
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reverse of these.
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2020-09-17:
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- In the vi and emacs line editors, repeat count parameters can now also be
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used for the arrow keys and the forward-delete key. E.g., in emacs mode,
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<ESC> 7 <left-arrow> will now move the cursor seven positions to the left.
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In vi control mode, this would be entered as: 7 <left-arrow>.
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- When a background job on an interactive shell received SIGINT or SIGPIPE, the
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job termination message was empty. It now shows "Interrupt" or "Broken Pipe".
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- The -m (-o monitor) option is no longer ignored when specified on the shell
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invocation command line.
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- A script that is interrupted with Ctrl+C now terminates its background jobs
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as expected, unless the -m (-o monitor) option was turned on.
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2020-09-14:
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- Corrected rounding of floating point values by ksh's printf %f formatting
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operator. Fix contributed by @hyenias.
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- The forward-delete key now works as expected in emacs and vi editing modes.
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2020-09-11:
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- The 'command' regular builtin utility (which runs a simple command, removing
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special properties) has been made fully POSIX compliant.
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1. The 'command' name can now result from an expansion (fixing BUG_CMDEXPAN),
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e.g. 'c=command; "$c" ls' and 'set -- command ls; "$@"' now work.
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2. If and only if the POSIX mode (the new -o posix shell option) is active,
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then the 'command' utility now disables not only "special" but also
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"declaration" properties of builtin commands that it invokes, meaning:
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a. arguments that start with a variable name followed by '=' are
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always treated as regular words subject to normal shell syntax;
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b. 'command' can now stop the shell from exiting if a command that it
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invokes tries to modify a readonly variable (fixing BUG_CMDSPEXIT).
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- The 'history' (== 'hist -l') and 'r' (== 'hist -s') interactive shell
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history commands have reverted to preset aliases and are now only loaded if
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the shell is interactive and not initialised in POSIX mode. This avoids
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unneeded conflicts with external commands by these names, particularly 'r'.
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2020-09-09:
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- Fixed BUG_LOOPRET2 and related bugs. The 'exit' and 'return' commands without
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an argument now correctly default to passing down the exit status of the
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last-run command. Tests like the following, in which the last-run command is
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'false', now correctly output 1 instead of 0:
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fn() { return || true; }; false; fn; echo "$?"
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fn() { while return; do true; done; }; false; fn; echo "$?"
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fn() { for i in 1; do return; done; }; false; fn; echo "$?"
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fn() { case 1 in 1) return ;; esac; }; false; fn; echo "$?"
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fn() { { return; } 2>&1; }; false; fn; echo "$?"
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2020-09-05:
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- Fixed erroneous syntax errors in parameter expansions such as ${var:-wor)d}
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or ${var+w(ord}. The parentheses now correctly lose their normal grammatical
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meaning within the braces. Fix by Eric Scrivner backported from ksh2020.
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2020-09-04:
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- Fixed a bug that caused a syntax error to be thrown if the special parameter
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expansions ${!} and ${$} (including braces) were used within a here-document.
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Bug reported by @Saikiran-m on GitHub.
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2020-09-01:
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- The bash-style '&>file' redirection shorthand (for '>file 2>&1') is now
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always recognised and not only when running rc/profile init scripts. It no
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longer issues a warning. This brings ksh93 in line with mksh, bash and zsh.
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- A long-form shell option '-o posix' has been added, which implements a
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mode for better compatibility with the POSIX standard. It is automatically
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turned on if ksh is invoked under the name 'sh'.
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For now, it:
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* disables the &> redirection shorthand
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* causes the 'let' arithmetic command to recognise octal numbers by
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leading zeros regardless of the setting of the 'letoctal' option
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* causes file descriptors > 2 to be left open when invoking another program
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* makes the <> redirection operator default to stdin instead of stdout
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(this keeps the 2020-05-13 BUG_REDIRIO fix for the POSIX mode while
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restoring traditional ksh93 behaviour for backwards compatibility)
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* disables a noncompliant 'test -t' == 'test -t 1' compatibility hack
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* disables passing an exported variable's attributes (such as integer or
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readonly) to a new ksh process through the environment
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2020-08-19:
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- Sped up the 'read' command on most systems by 15-25%. Fixed a hanging bug
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on reading from a FIFO that could occur on macOS.
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2020-08-17:
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- 'command -p' incorrectly used the hash table entry (a.k.a. tracked alias)
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for a command if its path was previously hashed. It has now been fixed so
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it never consults the hash table.
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2020-08-16:
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- Fixed 'command -x' on macOS, Linux and Solaris by accounting for a 16-byte
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argument alignment. If execution does fail, it now aborts with an internal
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error message instead of entering an infinite retry loop.
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2020-08-13:
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- Fixed memory leaks and a crashing bug that occurred when defining and
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running functions in subshells.
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2020-08-11:
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- Fixed an intermittent crash upon running a large number of subshells.
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2020-08-10:
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- A number of fixes have been applied to the printf formatting directives
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%H and %#H (as well as the undocumented equivalents %(html)q and %(url)q):
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1. Both formatters have been made multibyte/UTF-8 aware, and no longer
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delete multibyte characters. Invalid UTF-8 byte sequences are rendered
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as ASCII question marks.
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2. %H no longer wrongly changes spaces to non-breaking spaces ( ).
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3. %H now converts the single quote (') to '%#39;' instead of '''
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which is not a valid entity in all HTML versions.
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4. %#H failed to encode some reserved characters (e.g. '?') while encoding
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some unreserved ones (e.g. '~'). It now percent-encodes all characters
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except those 'unreserved' as per RFC3986 (ASCII alphanumeric plus -._~).
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- Fixed a crash that occurred intermittently after running an external
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command from a command substitution expanded from the $PS1 shell prompt.
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2020-08-09:
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- File name generation (a.k.a. pathname expansion, a.k.a. globbing) now
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never matches the special navigational names '.' (current directory) and
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'..' (parent directory). This change makes a pattern like .* useful; it
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now matches all hidden files (dotfiles) in the current directory, without
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the harmful inclusion of '.' and '..'.
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2020-08-08:
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- Argument checking in the 'redirect' builtin command (see 2020-06-11) has
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been improved to error out before executing redirections. For example, an
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error like 'redirect ls >foo.txt' now will not create 'foo.txt' and will
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not leave your standard output permanently redirected to it.
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2020-08-06:
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- Added the '${.sh.pid}' variable as an alternative to Bash's '$BASHPID'.
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This variable is set to the current shell's PID, unlike '$$' (which is
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set to the parent shell's PID). In virtual subshells '${.sh.pid}' is not
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changed from its previous value, while in forked subshells '${.sh.pid}'
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is set to the subshell's process ID.
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2020-08-05:
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- Fixed a bug in functions that caused ksh to crash when an array with an
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unset method was turned into a multidimensional array.
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- Fixed a bug that caused scripts to continue running after over-shifting
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in a function when the function call had a redirection.
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- When generating shellquoted strings (such as with 'printf %q'), the
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hexadecimal value of a quoted unprintable character was not protected with
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square braces, e.g. 0x12 followed by '3' would be quoted as '\x123', which
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is a different value. Such strings are now quoted like '\x[12]3' if the
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next character is a hexadecimal digit.
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2020-07-31:
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- Fixed a bug that caused multidimensional associative arrays to be created
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with an extra array member.
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- Fixed a bug that caused the expansions of positional parameters $1 - $9,
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as well as special parameters such as $? and $-, to corrupt any multibyte
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characters immediately following the expansion if a UTF-8 locale is active.
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2020-07-29:
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- On a ksh compiled to use fork(2) to run external commands, a bug has been
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fixed that caused signals (such as SIGINT, Ctrl+C) to be ignored within a
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non-forked subshell after running an external command within that subshell.
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2020-07-25:
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- Fixed BUG_MULTIBIFS: Multibyte characters can now be used as IFS
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delimiters. "$*" was incorrectly joining positional parameters on
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the first byte of a multibyte character. This was due to truncation
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based on the incorrect assumption the IFS would never be larger
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than a single byte.
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- Fixed a bug that caused the sleep builtin to continue after being given
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an unrecognized option. 'sleep -: 1' will now show a usage message and
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exit instead of sleep for one second.
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- Fixed a bug that caused the 'typeset' variable attributes -a, -A, -l, and
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-u to leak out of a subshell if they were set without assigning a value.
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2020-07-23:
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- Fixed an infinite loop that could occur when ksh is the system's /bin/sh.
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- A command substitution that is run on the same line as a here-document
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will no longer cause a syntax error.
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2020-07-22:
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- Fixed two race conditions when running external commands on
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interactive shells with job control active.
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2020-07-20:
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- If a shell function and a built-in command by the same name exist,
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'whence -a' and 'type -a' now report both.
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- Fixed a bug that caused file descriptors opened with 'redirect' or 'exec'
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to survive a subshell environment after exiting it.
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2020-07-19:
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- Fixed a crash that occurred in the '.' command when using kshdb.
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- Fixed a crash that occurred when attempting to use redirection with an
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invalid file descriptor.
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2020-07-16:
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- The 'history' and 'r' default aliases have been made regular built-ins,
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leaving zero default aliases.
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- Fixed a bug that caused 'sleep -s' to have no effect with intervals longer
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than 30 seconds.
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- The accuracy of the sleep builtin has been improved. It no longer ignores
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microseconds and doesn't add extra milliseconds when the interval is less
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than 31 seconds.
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2020-07-15:
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- The 'autoload', 'compound', 'float', 'functions', 'integer' and 'nameref'
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default aliases have been converted into regular built-in commands, so
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that 'unalias -a' does not remove them. Shell functions can now use
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these names, which improves compatibility with POSIX shell scripts.
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- The End key escape sequence '^[[F' is now handled in the emacs and vi editing
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modes. The End key moves the cursor to the end of the line (in contrast to
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the Home key doing the opposite).
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2020-07-14:
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- Fixed a bug that caused 'set -b' to have no effect.
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- Following the 'time' keyword, the 'times' builtin command now also
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supports millisecond precision.
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2020-07-13:
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- Fixed a fork bomb that could occur when the vi editor was sent SIGTSTP
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while running in a ksh script.
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- Appending a lone percent to the end of a format specifier no longer
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causes a syntax error. The extra percent will be treated as a literal
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'%', like in Bash and zsh.
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- The 'time' keyword now has proper support for millisecond precision.
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Although this feature was previously documented, the 'time' keyword
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only supported up to centisecond precision, which caused a command
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like the one below to return '0.000' on certain operating systems:
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$ TIMEFORMAT='%3R'; time sleep .003
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- The 'time' keyword now zero-pads seconds less than ten (like mksh).
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2020-07-10:
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- Fixed a bug that caused types created with 'typeset -T' to throw an error
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when used if the type name started with a lowercase 'a'.
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- A potential crash due to memory corruption when using many file
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descriptors has been fixed.
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2020-07-09:
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- Fixed a crash on syntax error when sourcing/dotting multiple files.
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- Fixed a crash when listing indexed arrays.
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- Fixed a memory leak when restoring PATH when temporarily setting PATH
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for a command (e.g. PATH=/foo/bar command ...) or in a virtual subshell.
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- Combining ((...)) with redirections no longer causes a syntax error
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due to the parser handling '>' incorrectly.
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- Fixed a bug that corrupted KIA/CQL cross-reference databases created using
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ksh's -R option; shell warnings were wrongly included in the database file.
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- The shell's quoting algorithm (used in xtrace, printf %q, and more) has been
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fixed for UTF-8 (Unicode) locales; it no longer needlessly and inconsistently
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encodes normal printable UTF-8 characters into hexadecimal \u[xxxx] codes.
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2020-07-07:
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- Four of the date formats accepted by 'printf %()T' have had their
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functionality altered to the common behavior of date(1):
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- '%k' and '%l' print the current hour with blank padding, the former
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|
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' 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 $PATH.
|
|
Before this fix, this was broken on non-interactive shells as the internal
|
|
variable holding the default PATH value was not correctly initialised.
|
|
|
|
2020-05-16:
|
|
|
|
- Fix 'test -t 1', '[ -t 1 ]', '[[ -t 1 ]]' in command substitutions.
|
|
Standard output (file descriptor 1) tested as being on a terminal within a
|
|
command substitution, which makes no sense as the command substitution is
|
|
supposed to be catching standard output.
|
|
v=$(echo begincomsub
|
|
[ -t 1 ] && echo oops
|
|
echo endcomsub)
|
|
echo "$v"
|
|
This now does not output "oops".
|
|
|
|
2020-05-14:
|
|
|
|
- Fix syncing history when print -s -f is used. For example, the
|
|
following now correctly adds a 'cd' command to the history:
|
|
print -s -f 'cd -- %q\n' "$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
|