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Top Forums Shell Programming and Scripting grep -F, what is it good for? Post 302623745 by intelinside on Saturday 14th of April 2012 01:25:10 PM
Old 04-14-2012
grep -F, what is it good for?

Hello, Unix-Forums!

I have a simple question:

I cannot see any difference between
Code:
grep [expression] [file]

and

Code:
grep -F [expression] [file]

The help says that "PATTERN is a set of newline-separated fixed strings"

Isn't this default anyway?
I'm a little bit confused.
 

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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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