Breaking long lines into (characters, newline, space) groups Post: 302316859

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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

05-17-2009

Registered User

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.

rowie718

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LEARN ABOUT REDHAT

igawk

IGAWK(1)							 Utility Commands							  IGAWK(1)

NAME

       igawk - gawk with include files

SYNOPSIS

       igawk [ all gawk options ] -f program-file [ -- ] file ...
       igawk [ all gawk options ] [ -- ] program-text file ...

DESCRIPTION

       Igawk is a simple shell script that adds the ability to have ``include files'' to gawk(1).

       AWK programs for igawk are the same as for gawk, except that, in addition, you may have lines like

	      @include getopt.awk

       in your program to include the file getopt.awk from either the current directory or one of the other directories in the search path.

OPTIONS

       See gawk(1) for a full description of the AWK language and the options that gawk supports.

EXAMPLES

       cat << EOF > test.awk
       @include getopt.awk

       BEGIN {
	    while (getopt(ARGC, ARGV, "am:q") != -1)
		 ...
       }
       EOF

       igawk -f test.awk

SEE ALSO

       gawk(1)

       Effective AWK Programming, Edition 1.0, published by the Free Software Foundation, 1995.

AUTHOR

       Arnold Robbins (arnold@skeeve.com).

Free Software Foundation					    Nov 3 1999								  IGAWK(1)

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LEARN ABOUT REDHAT

igawk