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Top Forums Shell Programming and Scripting Breaking long lines into (characters, newline, space) groups Post 302316859 by rowie718 on Sunday 17th of May 2009 03:29:15 AM
Old 05-17-2009
Thanks for the explanation. Im learning, but strangely, it seems that our systems are treating this code differently.

This script (without the if and next statements towards the end):

Code:
#!/bin/ksh

echo "How many characters per line?"
read length
echo "Where is the ldif file located that you would like to parse?"
read source_ldif
echo "Where would you like to output the parsed version to?"
read out_ldif

awk -v x=${length:-79} 'length > x {
    n=1
    while ( length($0) > x - 1 + n ) {
    printf "%s\n ", substr($0,1,x - 1 + n)
    $0 = substr($0,x + n)
    n=0

  }

}
{print}' "$source_ldif" > "$out_ldif"

applied to your source text:
Code:
abcdefghijklmnopqrstuvwxyz
ABCDEFGHIJKLMNOPQRSTUVWXY
abcdefghijklmnopqrstuvwxyz

with a length of 13, results in properly parsed text:
Code:
abcdefghijklm
 nopqrstuvwxy
 z
ABCDEFGHIJKLM
 NOPQRSTUVWXY
abcdefghijklm
 nopqrstuvwxy
 z

I tried to figure out which version of awk I have, but apparently it is not easy to do so. I am running os x client 10.4.11. On Apple's opensource distribution page, they list "awk-7" as an available download. I wonder how I can find out the version I am using, and if it makes sense that it's a different version of awk that accounts for the difference in output.
 

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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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