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Full Discussion: Grouping in grep
Top Forums UNIX for Dummies Questions & Answers Grouping in grep Post 302658085 by alister on Monday 18th of June 2012 07:02:43 PM
Old 06-18-2012
It looks like you're not using the quoting character. It should be ', not .

Note that the error is not from egrep; it's from bash. In the second example, since those backslashes do not occur within a quoted string, they are being interpreted by the shell, to whom they quote the following character. The special shell character generating the syntax error in the first example, (, in the second is quoted with a backslash, hence no syntax error.

Also, quoting aside, the second egrep's regular expression is incorrectly specified. Those backslash escaped characters are special by default in egrep's extended regular expression flavor; you only need to quote them if you want to match them literally. In grep's basic regular expression flavor, the situation is reversed: those characters are ordinary by default and need to be backslashed to become special.

Regards,
Alister

Last edited by alister; 06-18-2012 at 08:12 PM..
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ZGREP(1)						      General Commands Manual							  ZGREP(1)

NAME
zgrep - search possibly compressed files for a regular expression SYNOPSIS
zgrep [ grep_options ] [ -e ] pattern filename... DESCRIPTION
Zgrep is used to invoke the grep on compress'ed or gzip'ed files. All options specified are passed directly to grep. If no file is speci- fied, then the standard input is decompressed if necessary and fed to grep. Otherwise the given files are uncompressed if necessary and fed to grep. If zgrep is invoked as zegrep or zfgrep then egrep or fgrep is used instead of grep. If the GREP environment variable is set, zgrep uses it as the grep program to be invoked. For example: for sh: GREP=fgrep zgrep string files for csh: (setenv GREP fgrep; zgrep string files) AUTHOR
Charles Levert (charles@comm.polymtl.ca) SEE ALSO
grep(1), egrep(1), fgrep(1), zdiff(1), zmore(1), znew(1), zforce(1), gzip(1), gzexe(1) ZGREP(1)
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