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about pipe
Hi, while running: myapp 2>/dev/null& I want to change 2>&1 without stop this job. Is there some tips to finish it? Thanks in advance gan __ Do you Yahoo!? Yahoo! Mail - Helps protect you from nasty viruses. http://promotions.yahoo.com/new_mail ___ Bug-bash mailing list Bug-bash@gnu.org http://lists.gnu.org/mailman/listinfo/bug-bash
More bash POSIX-compliance bugs
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 While searching for more details about the requirement for `pwd -P' to set PWD in POSIX mode, I found several other compliance bugs: 1) time is no longer allowed to be a reserved word. For example: $ set -o posix $ alias !='echo hi;' $ alias time='echi hi;' $ ! true# ! is reserved word, not alias $ echo $? 1 $ time true # BUG: time should be an alias, and echo hi real0m0.000s user0m0.000s sys 0m0.000s $ set +o posix $ ! true# outside of posix mode, bash documents that hi # aliases take precedence over reserved words $ echo $? 0 $ time true # BUG: again, time should be an alias real0m0.000s user0m0.000s sys 0m0.000s $ (Likewise, source is not documented as a reserved word, but since time is a POSIX-required utiltiy while source is not, I am okay with source remaining a reserved word.) 2) The wording of bash-3.0/POSIX is misleading on item 4. Rather than stating "Reserved words may not be aliased", you should state something like "An aliased reserved word does not undergo alias expansion if it is in the context of a reserved word". As demonstrated in POSIX XRAT, an aliased reserved word that is not in the context of a reserved word undergoes alias expansion: $ alias while=hi $ alias foo='echo ' $ foo while hi 3) Items 18 and 19 of bash-3.0/POSIX are wrong. Reread the description of cd (http://www.opengroup.org/onlinepubs/009695399/utilities/cd.html), the interpretation on it (http://www.opengroup.org/austin/interps/uploads/40/6230/AI-037.txt), and pending corrections to the interpretation (https://www.opengroup.org/sophocles/show_mail.tpl?source=L&listname=austin-group-l&id=8042). Item 18 is wrong because there is nothing that states that the use of CDPATH turns on -P handling. And item 19 is wrong because when CDPATH without . fails to find a directory in step 5, step 6 reverts to using $PWD (the current directory). The following example is required to behave the same in POSIX mode as it currently does for normal bash mode: $ set -o posix $ cd /tmp $ mkdir -p a a/aa $ ln -s a b $ CDPATH=b cd aa /tmp/b/aa $ echo $PWD # BUG: Should be /tmp/b/aa, as printed /tmp/a/aa $ cd - /tmp $ CDPATH=/tmp/a/aa cd b # BUG: Should change to /tmp/b, and set PWD bash: cd: b: No such file or directory 4) POSIX requires that times be a special built-in. For example: $ foo=bar times 0m0.140s 0m0.156s 0m2.078s 0m0.683s $ echo foo: $foo # BUG: should print foo: bar foo: $ (On a related note, I think POSIX is ambiguous on the behavior of the following - does the setting of foo take place before or after it is unset? $ foo=bar unset foo $ echo $foo # Some shells echo bar, others echo nothing ) 5) POSIX requires that newgrp be provided as a regular shell built-in, as well as a standalone utility. POSIX states that "A common implementation of newgrp is that the current shell uses exec to overlay itself with newgrp, which in turn overlays itself with a new shell after changing group. On some implementations, however, this may not occur and newgrp may be invoked as a subprocess." It is the action of overlaying the current shell with newgrp which was the rationale for providing newgrp as a regular built-in, even if you choose to implement the built-in by simply deferring to the standalone utility rather than changing groups within bash before starting the new shell environment. On cygwin, where no one has yet ported a newgrp utility, bash currently fails to be POSIX-compliant because of the missing newgrp builtin: $ newgrp bash: newgrp: command not found - -- Life is short - so eat dessert first! Eric Blake [EMAIL PROTECTED] -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.0 (Cygwin) Comment: Public key at home.comcast.net/~ericblake/eblake.gpg Comment: Using GnuPG with Thunderbird - http://enigmail.mozdev.org iD8DBQFCGejm84KuGfSFAYARAo+PAKCny1cKGdJl8GMe2Q/7OzDpuEBT4wCgwZyN 2hfpZJ3mrIAIwiGD0B6L3J4= =2B62 -END PGP SIGNATURE- ___ Bug-bash mailing list Bug-bash@gnu.org http://lists.gnu.org/mailman/listinfo/bug-bash
Problem in the reverse history search
Configuration Information [Automatically generated, do not change]: Machine: i386 OS: linux-gnu Compiler: i386-redhat-linux-gcc Compilation CFLAGS: -DPROGRAM='bash' -DCONF_HOSTTYPE='i386' -DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='i386-redhat-linux-gnu' -DCONF_VENDOR='redhat' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash' -DSHELL -DHAVE_CONFIG_H -I. -I. -I./include -I./lib -D_FILE_OFFSET_BITS=64 -O2 -g -pipe -m32 -march=i386 -mtune=pentium4 uname output: Linux toubkal 2.6.10-1.741_FC3smp #1 SMP Thu Jan 13 16:53:16 EST 2005 i686 i686 i386 GNU/Linux Machine Type: i386-redhat-linux-gnu Bash Version: 3.0 Patch Level: 14 Release Status: release Description: sometimes, using the reverse search in the history (CTRL-r) and choosing a past command typing two letters, the command is executed, but on the shell the first letter matched is missing. Repeat-By: $bashbug-32 --help [CTRL+r]-- $bashbug-32 -help GNU bashbug, version 3.0.14-release ..etc ___ Bug-bash mailing list Bug-bash@gnu.org http://lists.gnu.org/mailman/listinfo/bug-bash
Re: about pipe
[EMAIL PROTECTED] wrote: Hi, while running: myapp 2>/dev/null& I want to change 2>&1 without stop this job. Is there some tips to finish it? Unless the app itself responds to a signal to do that, there is no way to accomplish it. At that point, it's out of the shell's hands. Chet -- ``The lyf so short, the craft so long to lerne.'' - Chaucer ( ``Discere est Dolere'' -- chet ) Live...Laugh...Love Chet Ramey, ITS, CWRU[EMAIL PROTECTED]http://tiswww.tis.cwru.edu/~chet/ ___ Bug-bash mailing list Bug-bash@gnu.org http://lists.gnu.org/mailman/listinfo/bug-bash
Re: about pipe
On Mon, Feb 21, 2005 at 05:19:22AM -0800, [EMAIL PROTECTED] wrote: [...] > while running: > > myapp 2>/dev/null& > > I want to change 2>&1 without stop this job. > Is there some tips to finish it? [...] If you mean that you also want to discard stdout, you can try: gdb myapp << EOF attach $! call dup2(2,1) detach EOF or: gdb myapp << EOF set auto-solib-add off attach $! share libc\\..* call dup2(1,2) detach EOF myapp needs to be linked dynamically to the libc and even then, hat's not guaranteed to work. -- Stéphane ___ Bug-bash mailing list Bug-bash@gnu.org http://lists.gnu.org/mailman/listinfo/bug-bash
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