Effects of grep -o when it's not available Post: 302268928

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Top Forums UNIX for Dummies Questions & Answers Effects of grep -o when it's not available Post 302268928 by earnstaf on Tuesday 16th of December 2008 02:38:48 PM

12-16-2008

Registered User

Quote:

Originally Posted by joeyg

Can you provide more detail on what you are trying to do? I am not familiar with the grep -o option.

grep -o would return just the match... so, if I entered:

Code:

> echo "this is a test" | grep -o test
> test
or
> echo "this is a test" | grep -o "this is"
> this is

whereas without the -o, both of the above would return the whole line "this is a test"

edit: syntax -- forgot quote Smilie

Last edited by earnstaf; 12-16-2008 at 03:47 PM..

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LEARN ABOUT POSIX

zgrep

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)