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Top Forums Shell Programming and Scripting Simple ways to pass variations to grep Post 302651275 by SkySmart on Tuesday 5th of June 2012 09:18:22 AM
Old 06-05-2012
Quote:
Originally Posted by zaxxon
Or similar to what you had already:
Code:
egrep -i "panic|error|fail" /var/log/messages

Like in elixir sinari's example, the -i switch is for "ignore case".

i was looking for something more complex. the "-i" will be slower when grepping through large files, which is what i'm dealing with.

i was thinking something along the lines of:

Code:
egrep "([pP]anic|[Ee]rror|[Ff]ail)" /var/log/messages

in this example, i know which letters may be small/upper case. so i took that into consideration. there are cases when u wont know, and i wanted to find a way to account for that, without using the "-i".

Last edited by Scrutinizer; 06-05-2012 at 10:39 AM.. Reason: 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 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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