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Top Forums Shell Programming and Scripting Simple ways to pass variations to grep Post 302651301 by Scrutinizer on Tuesday 5th of June 2012 09:51:35 AM
Old 06-05-2012
It probably depends on implementation, so you would need to find out if they matter in your case, but FWIW, a couple of times I found these to be the culprit. Perhaps because grep not only needs to create groups, but a back reference as well. In any case you do not need them here...

Last edited by Scrutinizer; 06-05-2012 at 11:05 AM..
 

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ZGREP(1)						    BSD General Commands Manual 						  ZGREP(1)

NAME
zgrep, zegrep, zfgrep -- print lines matching a pattern in gzip-compressed files SYNOPSIS
zgrep [grep-flags] [--] pattern [files ...] zegrep [grep-flags] [--] pattern [file ...] zfgrep [grep-flags] [--] pattern [file ...] DESCRIPTION
zgrep runs grep(1) on files or stdin, if no files argument is given, after decompressing them with zcat(1). The grep-flags and pattern arguments are passed on to grep(1). If an -e flag is found in the grep-flags, zgrep will not look for a pattern argument. zegrep calls egrep(1), while zfgrep calls fgrep(1). EXIT STATUS
In case of missing arguments or missing pattern, 1 will be returned, otherwise 0. SEE ALSO
egrep(1), fgrep(1), grep(1), gzip(1), zcat(1) AUTHORS
Thomas Klausner <wiz@NetBSD.org> BSD
December 28, 2003 BSD
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