gnu/167009: grep(1): GNU grep -q can exit !0 even if strings
found
David Wolfskill
david at catwhisker.org
Tue Apr 17 19:20:05 UTC 2012
The following reply was made to PR gnu/167009; it has been noted by GNATS.
From: David Wolfskill <david at catwhisker.org>
To: Jilles Tjoelker <jilles at stack.nl>
Cc: bug-followup at FreeBSD.org
Subject: Re: gnu/167009: grep(1): GNU grep -q can exit !0 even if strings found
Date: Tue, 17 Apr 2012 12:12:15 -0700
--5V5c01chtBAiSHoy
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
Content-Transfer-Encoding: quoted-printable
On Tue, Apr 17, 2012 at 09:08:12PM +0200, Jilles Tjoelker wrote:
> FreeBSD PR gnu/167009:
> > [strings -a /usr/local/bin/bison | grep -qw /usr/local fails]
>=20
> The peculiar thing is the shell, tcsh.
>=20
> What happens is that grep -q terminates early, so that strings receives
> SIGPIPE when it tries to write further data. Whereas the exit status
> of a pipeline in sh is always the exit status of the last element so
> that your command has the expected behaviour, this is different in tcsh.
> Tcsh looks backwards for a failing command if the last element has exit
> status 0, and returns the 141 corresponding to SIGPIPE.
> ...
Huh. Thanks for the explanation. :-}
Peace,
david
--=20
David H. Wolfskill david at catwhisker.org
Depriving a girl or boy of an opportunity for education is evil.
See http://www.catwhisker.org/~david/publickey.gpg for my public key.
--5V5c01chtBAiSHoy
Content-Type: application/pgp-signature
Content-Disposition: inline
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v2.0.19 (FreeBSD)
iEYEARECAAYFAk+NwI4ACgkQmprOCmdXAD1D9wCeJwFWkjE9cHPAeFSk3x0wTSgf
8wMAnA1SYowMAAcyvF3He4pz9NhkjrcS
=UOp+
-----END PGP SIGNATURE-----
--5V5c01chtBAiSHoy--
More information about the freebsd-bugs
mailing list