The following reply was made to PR gnu/167009; it has been noted by GNATS. From: David Wolfskill <da...@catwhisker.org> To: Jilles Tjoelker <jil...@stack.nl> Cc: bug-follo...@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 da...@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-- _______________________________________________ freebsd-bugs@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-bugs To unsubscribe, send any mail to "freebsd-bugs-unsubscr...@freebsd.org"
