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

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Jari Aalto 2002-07-17 14:10:11 +00:00
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131
CWRU/POSIX.NOTES
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Bash POSIX Mode
===============
Starting Bash with the `--posix' command-line option or executing `set
-o posix' while Bash is running will cause Bash to conform more closely
to the POSIX 1003.2 standard by changing the behavior to match that
specified by POSIX in areas where the Bash default differs.
The following list is what's changed when `POSIX mode' is in effect:
1. When a command in the hash table no longer exists, Bash will
re-search `$PATH' to find the new location. This is also
available with `shopt -s checkhash'.
2. The message printed by the job control code and builtins when a job
exits with a non-zero status is `Done(status)'.
3. The message printed by the job control code and builtins when a job
is stopped is `Stopped(SIGNAME)', where SIGNAME is, for example,
`SIGTSTP'.
4. Reserved words may not be aliased.
5. The POSIX 1003.2 `PS1' and `PS2' expansions of `!' to the history
number and `!!' to `!' are enabled, and parameter expansion is
performed on the values of `PS1' and `PS2' regardless of the
setting of the `promptvars' option.
6. Interactive comments are enabled by default. (Bash has them on by
default anyway.)
7. The POSIX 1003.2 startup files are executed (`$ENV') rather than
the normal Bash files.
8. Tilde expansion is only performed on assignments preceding a
command name, rather than on all assignment statements on the line.
9. The default history file is `~/.sh_history' (this is the default
value of `$HISTFILE').
10. The output of `kill -l' prints all the signal names on a single
line, separated by spaces.
11. Non-interactive shells exit if FILENAME in `.' FILENAME is not
found.
12. Non-interactive shells exit if a syntax error in an arithmetic
expansion results in an invalid expression.
13. Redirection operators do not perform filename expansion on the word
in the redirection unless the shell is interactive.
14. Redirection operators do not perform word splitting on the word in
the redirection.
15. Function names must be valid shell `name's. That is, they may not
contain characters other than letters, digits, and underscores, and
may not start with a digit. Declaring a function with an invalid
name causes a fatal syntax error in non-interactive shells.
16. POSIX 1003.2 `special' builtins are found before shell functions
during command lookup.
17. If a POSIX 1003.2 special builtin returns an error status, a
non-interactive shell exits. The fatal errors are those listed in
the POSIX.2 standard, and include things like passing incorrect
options, redirection errors, variable assignment errors for
assignments preceding the command name, and so on.
18. If the `cd' builtin finds a directory to change to using
`$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
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
given as an argument to `cd' exists in the current directory.
20. A non-interactive shell exits with an error status if a variable
assignment error occurs when no command name follows the assignment
statements. A variable assignment error occurs, for example, when
trying to assign a value to a readonly variable.
21. A non-interactive shell exits with an error status if the iteration
variable in a `for' statement or the selection variable in a
`select' statement is a readonly variable.
22. Process substitution is not available.
23. Assignment statements preceding POSIX 1003.2 special builtins
persist in the shell environment after the builtin completes.
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:
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.

3318
CWRU/changelog
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19
CWRU/misc/bison
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@ -1,4 +1,23 @@
#! /bin/sh
#
# bison -- just call yacc
#
# Copyright (C) 1996-2002 Free Software Foundation, Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2, or (at your option)
# any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111 USA.
if [ "$1" = '-y' ]; then
shift

18
CWRU/misc/errlist.c
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@ -2,6 +2,24 @@
* If necessary, link with lib/sh/libsh.a
*/
/* Copyright (C) 1998-2002 Free Software Foundation, Inc.
This file is part of GNU Bash, the Bourne Again SHell.
Bash is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 2, or (at your option) any later
version.
Bash is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License along
with Bash; see the file COPYING. If not, write to the Free Software
Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */
#include <stdio.h>
#include <errno.h>

18
CWRU/misc/hpux10-dlfcn.h
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@ -17,6 +17,24 @@
* the -E flag to LOCAL_LDFLAGS.
*/
/* Copyright (C) 1998-2002 Free Software Foundation, Inc.
This file is part of GNU Bash, the Bourne Again SHell.
Bash is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 2, or (at your option) any later
version.
Bash is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License along
with Bash; see the file COPYING. If not, write to the Free Software
Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */
#if !defined (__HPUX10_DLFCN_H__)
#define __HPUX10_DLFCN_H__

21
CWRU/misc/open-files.c
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@ -1,3 +1,23 @@
/* open-files -- report files a process has open */
/* Copyright (C) 1989-2002 Free Software Foundation, Inc.
This file is part of GNU Bash, the Bourne Again SHell.
Bash is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 2, or (at your option) any later
version.
Bash is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License along
with Bash; see the file COPYING. If not, write to the Free Software
Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */
#include <sys/types.h>
#include <fcntl.h>
#include <sys/file.h>
@ -13,4 +33,3 @@ main()
}
exit(0);
}

7
CWRU/misc/pid.c
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@ -1,7 +0,0 @@
#include <stdio.h>
main()
{
fprintf(stderr, "%d\n", getpid());
exit(0);
}

20
CWRU/misc/sigs.c
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@ -1,3 +1,23 @@
/* sigs - print signal dispositions for a process */
/* Copyright (C) 1990-2002 Free Software Foundation, Inc.
This file is part of GNU Bash, the Bourne Again SHell.
Bash is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 2, or (at your option) any later
version.
Bash is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License along
with Bash; see the file COPYING. If not, write to the Free Software
Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */
#include <signal.h>
#include <stdio.h>

20
CWRU/misc/sigstat.c
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@ -1,8 +1,28 @@
/*
* sigstat - print out useful information about signal arguments
*
* Chet Ramey
* chet@po.cwru.edu
*/
/* Copyright (C) 1991-2002 Free Software Foundation, Inc.
This file is part of GNU Bash, the Bourne Again SHell.
Bash is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 2, or (at your option) any later
version.
Bash is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License along
with Bash; see the file COPYING. If not, write to the Free Software
Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */
#include <sys/types.h>
#include <signal.h>
#include <stdio.h>