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Top Forums Shell Programming and Scripting use awk to edit a file..pls help Post 302438065 by dhe.arora on Sunday 18th of July 2010 06:45:41 AM
Old 07-18-2010
use awk to edit a file..pls help

hey i want to over write the fourth field of a ':' delimited file by first finding the required row by using grep.
i have done the following
Code:
cat file | grep no. | awk -F ':' { $4=count; print $1:$2:$3:$4;}


the correct values are being printed but nothin is bein added to the file..please help.What is wrong ?

Last edited by Scott; 07-18-2010 at 07:56 AM.. Reason: Please use code tags
 

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ZGREP(1)						    BSD General Commands Manual 						  ZGREP(1)

NAME
zgrep, zegrep, zfgrep -- print lines matching a pattern in gzip-compressed files SYNOPSIS
zgrep [grep-flags] [--] pattern [files ...] zegrep [grep-flags] [--] pattern [file ...] zfgrep [grep-flags] [--] pattern [file ...] DESCRIPTION
zgrep runs grep(1) on files or stdin, if no files argument is given, after decompressing them with zcat(1). The grep-flags and pattern arguments are passed on to grep(1). If an -e flag is found in the grep-flags, zgrep will not look for a pattern argument. zegrep calls egrep(1), while zfgrep calls fgrep(1). EXIT STATUS
In case of missing arguments or missing pattern, 1 will be returned, otherwise 0. SEE ALSO
egrep(1), fgrep(1), grep(1), gzip(1), zcat(1) AUTHORS
Thomas Klausner <wiz@NetBSD.org> BSD
December 28, 2003 BSD
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