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Full Discussion: Merge two files matching columns
Top Forums Shell Programming and Scripting Merge two files matching columns Post 302773009 by fhluque on Wednesday 27th of February 2013 07:00:21 AM
Old 02-27-2013
Merge two files matching columns
Hi!

I need to merge two files when col1 (x:x:x) matching and adds second column from file1.txt.

Code:
[root@test]# cat 1.txt 
aaa;a12
bbb;b13
ccc;c33
ddd;d55
eee;e11

Code:
[root@test]# cat 2.txt 
bbb;b55;34444;d55
aaa;a15;35666;a44


I try with this awk and I get succesfully first column from 1.txt:
Code:
[root@test]# awk -F";" 'NR==FNR{a[$1  ]=$1;next} ($1 ) in a {print $1,$2,a[$1]}' 1.txt 2.txt
bbb b55 bbb
aaa a15 aaa

But I need second column from 1.txt like this output :
Code:
bbb b55 b13
aaa a15 a12


But when I try with a[$2] is a empty variable:
Code:
[root@test]# awk -F";" 'NR==FNR{a[$1  ]=$1;next} ($1 ) in a {print $1,$2,a[$2]}' 1.txt 2.txt
bbb b55 
aaa a15

Why? Any help please?

Best regards,
FHL
Last edited by Scrutinizer; 02-27-2013 at 08:59 AM.. Reason: code tags
 

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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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