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Full Discussion: output of grep
Top Forums Shell Programming and Scripting output of grep Post 302136460 by useless79 on Tuesday 18th of September 2007 02:20:35 AM
Old 09-18-2007
output of grep

hi,

why the following is giving entire /etc/passwd file as output
even when it does not contain ^ or $ .

grep ' [^$] ' /etc/passwd


whereas the following is not giving any output


grep ' ^$ ' /etc/passwd
 

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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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