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Full Discussion: Comparing two files in UNIX and create a new file similar to equi join
Top Forums Shell Programming and Scripting Comparing two files in UNIX and create a new file similar to equi join Post 302934166 by Akshay Hegde on Thursday 5th of February 2015 04:32:17 AM
Old 02-05-2015
Code:
[akshay@localhost tmp]$ cat f1
a1,b1,1
a2,b2,2
a3,b4,3
a4,b3,4

Code:
[akshay@localhost tmp]$ cat f2
5,a1,b1
6,a2,b2
7,a3,b3
8,a4,b4

Code:
$ awk -F, 'FNR==NR{a[$2,$3];next}($1,$2) in a'  f2 f1
a1,b1,1
a2,b2,2


OR

Code:
[akshay@localhost tmp]$ awk -F, 'FNR==NR{a[$1,$2]=$0;next}($2,$3) in a{print a[$2,$3]}'   f1 f2
a1,b1,1
a2,b2,2

--edit--

Code:
awk -F, '
          # Here we read file1 (f1)
	  # FNR == NR only while reading first file

	  FNR==NR{
		   # We are interested in comparing
		   # Column1 and Column2 of file1 with
		   # Column2 and Column3 of file2, So
		   # here we create index Column1,Column2 ($1,$2)
                   # and its saved in array "a" where array value
		   # will be record of file1

		   a[$1,$2]=$0

		   # The next statement forces awk to 
		   # immediately stop processing the current record and go on to the next record

		   next
		 }

         # Here we read file2 (f2)
	 # again here we create index using column2 and column3 ($2,$3) of file2
	 # if index exists in array "a" we created above
	 # then print array value

     ($2,$3) in a{
		   print a[$2,$3]
		 }
       '   f1 f2

-F, -> Field separator is set to comma
Last edited by Akshay Hegde; 02-05-2015 at 06:01 AM..
 

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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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