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Imported from ../bash-2.05.tar.gz.

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Jari Aalto 2001-04-06 19:14:31 +00:00
commit 28ef6c316f
251 changed files with 22319 additions and 12413 deletions
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38
CWRU/POSIX.NOTES
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@ -12,10 +12,12 @@ The following list is what's changed when `POSIX mode' is in effect:
re-search `$PATH' to find the new location. This is also
available with `shopt -s checkhash'.
2. The `>&' redirection does not redirect stdout and stderr.
2. The message printed by the job control code and builtins when a job
exits with a non-zero status is `Done(status)'.
3. The message printed by the job control code and builtins when a job
exits with a non-zero status is `Done(status)'.
is stopped is `Stopped(SIGNAME)', where SIGNAME is, for example,
`SIGTSTP'.
4. Reserved words may not be aliased.
@ -69,7 +71,7 @@ The following list is what's changed when `POSIX mode' is in effect:
`$CDPATH', the value it assigns to the `PWD' variable does not
contain any symbolic links, as if `cd -P' had been executed.
19. If `$CDPATH' is set, the `cd' builtin will not implicitly append
19. If `CDPATH' is set, the `cd' builtin will not implicitly append
the current directory to it. This means that `cd' will fail if no
valid directory name can be constructed from any of the entries in
`$CDPATH', even if the a directory with the same name as the name
@ -89,9 +91,27 @@ The following list is what's changed when `POSIX mode' is in effect:
23. Assignment statements preceding POSIX 1003.2 special builtins
persist in the shell environment after the builtin completes.
24. The `export' and `readonly' builtin commands display their output
24. Assignment statements preceding shell function calls persist in the
shell environment after the function returns, as if a POSIX
special builtin command had been executed.
25. The `export' and `readonly' builtin commands display their output
in the format required by POSIX 1003.2.
26. The `trap' builtin displays signal names without the leading `SIG'.
27. The `.' and `source' builtins do not search the current directory
for the filename argument if it is not found by searching `PATH'.
28. Subshells spawned to execute command substitutions inherit the
value of the `-e' option from the parent shell. When not in POSIX
mode, Bash clears the `-e' option in such subshells.
29. Alias expansion is always enabled, even in non-interactive shells.
30. When the `set' builtin is invoked without options, it does not
display shell function names and definitions.
There is other POSIX 1003.2 behavior that Bash does not implement.
Specifically:
@ -99,3 +119,13 @@ Specifically:
1. Assignment statements affect the execution environment of all
builtins, not just special ones.
2. When a subshell is created to execute a shell script with execute
permission, but without a leading `#!', Bash sets `$0' to the full
pathname of the script as found by searching `$PATH', rather than
the command as typed by the user.
3. When using `.' to source a shell script found in `$PATH', bash
checks execute permission bits rather than read permission bits,
just as if it were searching for a command.