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Top Forums Shell Programming and Scripting awk - Must "touch" a $n-variable to get OFS used? Post 302673997 by alister on Wednesday 18th of July 2012 06:59:51 PM
Old 07-18-2012
Quote:
Originally Posted by 244an
The problem is not how to solve this, I want to know how awk works.
The original record, $0, is not modified by the awk field splitting process nor is it modified by setting the value of OFS. When you print $0, it is printed as is, regardless of the value of OFS.

OFS is used in two situations:
1. To separate the print statment's arguments.
2. As the field separator when $0 needs to be rebuilt, which happens when a field is assigned a value (this includes the use of the sub/gsub functions) or when you assign to a new field beyond the current value of NF.

The awk standard document: http://pubs.opengroup.org/onlinepubs...ities/awk.html

Regards,
Alister

Last edited by alister; 07-18-2012 at 08:07 PM..
 

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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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