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Full Discussion: AWK help reqd
Top Forums Shell Programming and Scripting AWK help reqd Post 302184242 by era on Friday 11th of April 2008 03:11:13 AM
Old 04-11-2008
I would not use awk for this.

Code:
cut -c21-31 file1 | sed -e 's/[][\\.*^$]/\\&/g' -e 's/^/^/' | grep -f - file2

Add a -v to the last grep to get the non-matches.

The middle part takes care to escape any regular expression special characters so you can pass them to grep. This is off the cuff so I probably forgot about one or two which would need escaping.
 

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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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