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Top Forums Shell Programming and Scripting how Print previous line .......... Post 302341100 by fabi20 on Wednesday 5th of August 2009 05:12:46 AM
Old 08-05-2009
thanks a lot for the help...a last question..it's possible to set the external variable of this case :
Code:
awk -v v="CHE" '{_[NR]=$0}{for(x=0;x++<NF;)if($x==v){for(y=4;--y;) print _[(NR-y)];printf "\n"}}' file

from the keybord across the function READ?....




From jmc: next time use code tags [ c o d e ] your code here [ / c o d e ] (remove spaces to make tags work).

Last edited by jim mcnamara; 08-13-2009 at 06:49 PM..
 

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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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