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(k)sh.1: invocation-related edits for clarity and completeness
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1 changed files with 44 additions and 10 deletions
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@ -3940,8 +3940,8 @@ redefined for each instance.
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.PP
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.PP
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When a type is defined a special built-in command of that name
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When a type is defined a special built-in command of that name
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is added. These built-ins are declaration commands and follow the
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is added. These built-ins are declaration commands and follow the
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same expansion rules as all the special built-in commands defined
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same expansion rules as the built-in commands described below
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below that are preceded by \(dg\(dg. These commands can subsequently
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that are marked with a \(dd symbol. These commands can subsequently
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be used inside further type definitions. The man page for these commands can
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be used inside further type definitions. The man page for these commands can
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be generated by using the
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be generated by using the
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.B \-\-man
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.B \-\-man
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@ -7054,7 +7054,7 @@ to fail or zero if no command has failed.
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.TP 8
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.TP 8
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.B posix
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.B posix
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Enable full POSIX standard compliance mode. This option
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Enable full POSIX standard compliance mode. This option
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is on by default if ksh is invoked as \fBsh\fR. It
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is on by default if ksh is invoked as \fBsh\fR, \fBrsh\fR, or \fBpfsh\fR. It
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disables passing exported variables' attributes (such as integer or readonly) to a new ksh process through the environment,
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disables passing exported variables' attributes (such as integer or readonly) to a new ksh process through the environment,
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causes file descriptors > 2 to be left open when invoking another program,
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causes file descriptors > 2 to be left open when invoking another program,
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makes the \fB<>\fR redirection operator default to standard input,
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makes the \fB<>\fR redirection operator default to standard input,
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@ -8046,14 +8046,48 @@ all interpretations of the given name to be reported.
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.SS Invocation.
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.SS Invocation.
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If the shell is invoked by
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If the shell is invoked by
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.IR exec (2),
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.IR exec (2),
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and the first character of argument zero
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initialization depends on argument zero
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.RB ( $0 )
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.RB ( $0 )
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as follows.
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If the first character of
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.B $0
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is
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is
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.BR \- ,
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.BR \- ,
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or the
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.B \-l
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option is given on the invocation command line,
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then the shell is assumed to be a
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then the shell is assumed to be a
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.I login
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.I login
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shell and
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shell.
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commands are read from
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If the basename of the command path in
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.B $0
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is
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.BR rsh ,
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.BR rksh ,
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or
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.BR krsh ,
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then the shell becomes restricted.
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If it is
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.BR pfsh
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or
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.BR pfksh ,
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then the shell becomes a profile shell (see
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.IR pfexec (1)).
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If the basename is
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.BR sh ,
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.BR rsh ,
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or
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.BR pfsh ,
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or the
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.B \-o\ posix
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option is given on the invocation command line, then
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the shell is initialized in full POSIX compliance mode
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(see the
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.B set
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builtin command above for more information).
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After this, if the shell was assumed to be a
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.I login
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shell, commands are read from
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.B /etc/profile
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.B /etc/profile
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and then from either
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and then from either
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.B .profile
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.B .profile
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@ -8062,12 +8096,12 @@ in the current directory or
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if either file exists.
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if either file exists.
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Next, for interactive shells, commands are read from
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Next, for interactive shells, commands are read from
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the file named by
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the file named by
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performing parameter expansion, command substitution,
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and arithmetic substitution on
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the value of the environment variable
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.SM
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.SM
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.B ENV
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.B ENV
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if the file exists.
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if the file exists, its name being determined by
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performing parameter expansion, command substitution,
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and arithmetic substitution on
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the value of that environment variable.
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If the
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If the
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.B \-s
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.B \-s
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option is not present and
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option is not present and
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