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Top Forums Shell Programming and Scripting Compare the value in between square brackets in file Post 302894993 by jim mcnamara on Friday 28th of March 2014 07:58:53 AM
Old 03-28-2014
I'm confused - what do you expect to get? You show output you did not want, it seems.

Note: grep -Po '(?<=\[)$Thread(?=\])' is surrounded by ' ' (single quotes) so that shell cannot expand the variable $Thread
 

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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 invokes grep on compressed or gzipped files. These grep options will cause zgrep to terminate with an error code: (-[drRzZ]|--di*|--exc*|--inc*|--rec*|--nu*). All other options specified are passed directly to grep. If no file is specified, 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 the GREP environment variable is set, zgrep uses it as the grep program to be invoked. EXIT CODE
2 - An option that is not supported was specified. AUTHOR
Charles Levert (charles@comm.polymtl.ca) SEE ALSO
grep(1), gzexe(1), gzip(1), zdiff(1), zforce(1), zmore(1), znew(1) ZGREP(1)
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