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Top Forums UNIX for Dummies Questions & Answers problem with grep on search string in a txt file over multiple files Post 302196464 by jim mcnamara on Sunday 18th of May 2008 01:06:17 PM
Old 05-18-2008
A 25k long search string? Is your text so similar that you need to search 25000 characters to be sure of a match. Assuming the regex engine can even deal with that, the search efficiency is going to be pretty poor.

Or do you mean 25000 different strings? That has problems as well.

I think, rather than you tell us how you think it should be done, give us the problem you are trying to solve - in detail. This whole thing sounds wrong from the start, as I read it.

There are a lot of other tools out there like comm for example.
 

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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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