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Full Discussion: How to filter only comments while reading a file including line break characters.
Top Forums Shell Programming and Scripting How to filter only comments while reading a file including line break characters. Post 302418238 by kchinnam on Monday 3rd of May 2010 03:20:06 PM
Old 05-03-2010
Code:
$> awk 'NF && $1 != "#"{sub("#.*","");print}' input.txt
awk: syntax error near line 1
awk: bailing out near line 1

I needed to use xpg4 version of awk on my Solaris8 box.

Code:
$>/usr/xpg4/bin/awk 'NF && $1 != "#"{sub("#.*","");print}' input.txt
one="1111111" 
two="22222222"
        three=333333333

Frank That is great., Its working..
Do you have any ideas to trim prefix spaces also?

I am not sure what we are getting by added complexity.. here.. Dan Please explain what the intent is ..

Code:
$>/usr/xpg4/bin/awk '$1!="#" && NF{gsub(/^ */,"",$0);sub("#.*",x);print}' input.txt
one="1111111" 
two="22222222"
        three=333333333

Again,, Please give me ideas to trim space characters at the beginning of lines. I know something line
Code:
cat input.txt | awk '{print $1}'

can do that,, but is there a more elegant one ?
 

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LEARN ABOUT MOJAVE

par::filter5.18

PAR::Filter(3)						User Contributed Perl Documentation					    PAR::Filter(3)

NAME

       PAR::Filter - Input filter for PAR

SYNOPSIS

	   $code = 'use strict; print "Hello, World!
";';
	   $ref = PAR::Filter->new('PodStrip', 'Bleach')->apply($code);
	   print $code;    # pod-stripped and obfuscated code
	   print $$ref;    # same thing

	   $ref = PAR::Filter->new('PodStrip', 'Bleach')->apply('file.pl');
	   print $$ref;    # same thing, applied to file.pl

DESCRIPTION

       Starting with PAR 0.76, "pp -f" takes a filter name, like "Bleach", and invokes this module to transform the programs with
       PAR::Filter::Bleach.  Similarily, "pp -F Bleach" applies the Bleach filter to all included modules.

       It is possible to pass in multiple such filters, which are applied in turn.

       The output of each such filter is expected be semantically equivalent to the input, although possibly obfuscated.

       The default list of filters include:

       o   PAR::Filter::Bleach

	   The archetypical obfuscating filter.

       o   PAR::Filter::Obfuscate

	   Use B::Deobfuscate to strip away indents and comments, as well as mangling variable names.

       o   PAR::Filter::PatchContent

	   Fix PAR-incompatible modules, applied to modules by default.

       o   PAR::Filter::PodStrip

	   Strip away POD sections, applied to modules by default.

       o   PAR::Filter::Bytecode

	   Use B::Bytecode to strip away indents and comments.	This filter is deprecated! For source hiding, have a look at PAR::Filter::Crypto
	   instead and make sure to read about its caveats.

AUTHORS

       Audrey Tang <cpan@audreyt.org>

COPYRIGHT

       Copyright 2003-2009 by Audrey Tang <cpan@audreyt.org>.

       This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

       See <http://www.perl.com/perl/misc/Artistic.html>

perl v5.18.2							    2012-01-06							    PAR::Filter(3)
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