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Top Forums Shell Programming and Scripting Help required in searching of pattern. Post 302886575 by learnbash on Saturday 1st of February 2014 10:45:19 PM
Old 02-01-2014
Quote:
Originally Posted by RudiC
In sed's s(ubstitute) comamnd, the first term is a regex so you need to escape the dots (if you want to be very accurate), while the second is just plain text (except for e.g. \n).
If you want to do arithmetics, you'd be better off utilising tools like awk or perl, where you can modify the IPs as well as serial No.s in one single script.
Please can you give me any example of awk or perl, how i can achieve that?
 

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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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