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Top Forums UNIX for Advanced & Expert Users Best way to search for patterns in huge text files Post 302385624 by andy2000 on Friday 8th of January 2010 05:27:04 PM
Old 01-08-2010
thank u for your quick replay...but it does not work ..

I need something faster than the following solution:
Code:
for i in `cat pattern_file`
do
  grep $i  input_file1 >> output_file1
  grep $i  input_file2 >> output_file2  
  grep $i  input_file3 >> output_file3
done

Any ideas please!!!

Last edited by Scott; 01-08-2010 at 06:32 PM.. Reason: Please use code tags
 

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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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