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Top Forums Shell Programming and Scripting awk script: print line number n of another file Post 302396768 by kpg on Friday 19th of February 2010 08:47:09 AM
Old 02-19-2010
ahmad.diab, I am sorry, but I do not understand how this code works. I need to modify it

Code:
awk 'BEGIN { ...set some variables
}

{ # main
# set variables based on substrings of $1, e.g 
line_nr=int(substr($1,0,9));

# print something
# and then want awk to print the "matching" line in fileB
}'


I tried a lot of integrating this with your code, but ended with syntax errors.
My approach with system calls works, but yours is performing a lot better,
Any help appreciated.

with no luck.
 

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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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