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Full Discussion: Grep Command
Top Forums UNIX for Advanced & Expert Users Grep Command Post 302339129 by dwgi32 on Wednesday 29th of July 2009 09:11:17 PM
Old 07-29-2009
Hi pileofrogs,

I am trying to do a selection of lines in the file that fullfilled a matching prefix i.e. [ABC]. Initially, i don't know about the limitation on the number of characters permitted by grep command until i trying to grep a line with 7000 characters and i found that it only return 2048. So i perform a google and found that the command is actually limited by the macro define in ulimit.h under the system include folder.

The man page does not mention about it but it does breifly touch on environmental varaibles hence i am trying to find out if anyone has experiences with manipulation of the environmental variable in grep.

Cheers
 

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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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