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Full Discussion: Problem passing a search pattern to AWK inside a script loop
Top Forums Shell Programming and Scripting Problem passing a search pattern to AWK inside a script loop Post 302606984 by quinestor on Tuesday 13th of March 2012 09:34:11 AM
Old 03-13-2012
Problem passing a search pattern to AWK inside a script loop
Learning, stumbling! My progress in shell scripting is slow. Now I have this doubt:

I have the following file (users.txt):

Code:
AU0909,on
AU0309,off
AU0209,on
AU0109,off

And this file (userson.txt)
Code:
AU0909
AU0209
AU0109
AU0309

I just want to set those users on userson.txt to "off" in the users.txt file. String substitution.
This is an exercise with AWK, I already know other methods to change it but I'm interested in AWK.

Now, I tried this in a script:

Script1.sh
Code:
 
AuxLine="AU0909"
awk -v idusr=${AuxLine} 'BEGIN { FS = "," } ; $0 ~ idusr { print $2}' users.txt

That works for that given string, but I for hours I can't see why this does not work:

Code:
while read AuxLine
do
  awk -v idusr=${AuxLine} 'BEGIN { FS = "," } ; $0 ~ idusr { print $2}' users.txt
done < userson.txt

The variable is passed correctly (read from usersons.txt) as I already tried printing it with no search pattern and it did print. I just can't see how the loop is preventing this simple command to work.

Any clues?
Last edited by quinestor; 03-13-2012 at 04:45 PM..
 

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LEARN ABOUT CENTOS

locale::codes::langfam

Locale::Codes::LangFam(3)				User Contributed Perl Documentation				 Locale::Codes::LangFam(3)

NAME

       Locale::Codes::LangFam - standard codes for language extension identification

SYNOPSIS

	  use Locale::Codes::LangFam;

	  $lext = code2langfam('apa');		       # $lext gets 'Apache languages'
	  $code = langfam2code('Apache languages');    # $code gets 'apa'

	  @codes   = all_langfam_codes();
	  @names   = all_langfam_names();

DESCRIPTION

       The "Locale::Codes::LangFam" module provides access to standard codes used for identifying language families, such as those as defined in
       ISO 639-5.

       Most of the routines take an optional additional argument which specifies the code set to use. If not specified, the default ISO 639-5
       language family codes will be used.

SUPPORTED CODE SETS

       There are several different code sets you can use for identifying language families. A code set may be specified using either a name, or a
       constant that is automatically exported by this module.

       For example, the two are equivalent:

	  $lext = code2langfam('apa','alpha');
	  $lext = code2langfam('apa',LOCALE_LANGFAM_ALPHA);

       The codesets currently supported are:

       alpha
	   This is the set of three-letter (lowercase) codes from ISO 639-5 such as 'apa' for Apache languages.

	   This is the default code set.

ROUTINES

       code2langfam ( CODE [,CODESET] )
       langfam2code ( NAME [,CODESET] )
       langfam_code2code ( CODE ,CODESET ,CODESET2 )
       all_langfam_codes ( [CODESET] )
       all_langfam_names ( [CODESET] )
       Locale::Codes::LangFam::rename_langfam  ( CODE ,NEW_NAME [,CODESET] )
       Locale::Codes::LangFam::add_langfam  ( CODE ,NAME [,CODESET] )
       Locale::Codes::LangFam::delete_langfam  ( CODE [,CODESET] )
       Locale::Codes::LangFam::add_langfam_alias  ( NAME ,NEW_NAME )
       Locale::Codes::LangFam::delete_langfam_alias  ( NAME )
       Locale::Codes::LangFam::rename_langfam_code  ( CODE ,NEW_CODE [,CODESET] )
       Locale::Codes::LangFam::add_langfam_code_alias  ( CODE ,NEW_CODE [,CODESET] )
       Locale::Codes::LangFam::delete_langfam_code_alias  ( CODE [,CODESET] )
	   These routines are all documented in the Locale::Codes::API man page.

SEE ALSO

       Locale::Codes
	   The Locale-Codes distribution.

       Locale::Codes::API
	   The list of functions supported by this module.

       http://www.loc.gov/standards/iso639-5/id.php
	   ISO 639-5 .

AUTHOR

       See Locale::Codes for full author history.

       Currently maintained by Sullivan Beck (sbeck@cpan.org).

COPYRIGHT

	  Copyright (c) 2011-2013 Sullivan Beck

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

perl v5.16.3							    2013-02-27						 Locale::Codes::LangFam(3)
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