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Top Forums Shell Programming and Scripting awk - treating remaining columns as one Post 302730969 by ctsgnb on Wednesday 14th of November 2012 03:11:09 AM
Old 11-14-2012
Quote:
Originally Posted by Scrutinizer
@cts. bala@ the difference occurs not because of awk versions but because you are using different different data samples. With bala's data sample this part of ctsgnb's code is problematic: sub(".*"$3,$3) , which matches upto the last occurence of "this", because of greedy matching..



--
@cts: nice sed/xargs
@bala: thanks Smilie

@Scruti

Ah ok ... i got it now (gush!, how did i miss it !) Smilie , thx !

By the way, in the code:

Code:
awk '{$1=$1; sub(FS,RS); sub(FS,RS)}1' infile

The $1=$1 is not necessary, is it ?

Last edited by ctsgnb; 11-14-2012 at 04:18 AM..
 

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English(3pm)						 Perl Programmers Reference Guide					      English(3pm)

NAME
English - use nice English (or awk) names for ugly punctuation variables SYNOPSIS
use English; use English qw( -no_match_vars ) ; # Avoids regex performance penalty # in perl 5.16 and earlier ... if ($ERRNO =~ /denied/) { ... } DESCRIPTION
This module provides aliases for the built-in variables whose names no one seems to like to read. Variables with side-effects which get triggered just by accessing them (like $0) will still be affected. For those variables that have an awk version, both long and short English alternatives are provided. For example, the $/ variable can be referred to either $RS or $INPUT_RECORD_SEPARATOR if you are using the English module. See perlvar for a complete list of these. PERFORMANCE
NOTE: This was fixed in perl 5.20. Mentioning these three variables no longer makes a speed difference. This section still applies if your code is to run on perl 5.18 or earlier. This module can provoke sizeable inefficiencies for regular expressions, due to unfortunate implementation details. If performance matters in your application and you don't need $PREMATCH, $MATCH, or $POSTMATCH, try doing use English qw( -no_match_vars ) ; . It is especially important to do this in modules to avoid penalizing all applications which use them. perl v5.18.2 2014-01-06 English(3pm)
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