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Top Forums Shell Programming and Scripting Merge two columns from two files into one if another column matches Post 302723087 by pbluescript on Monday 29th of October 2012 11:20:44 AM
Old 10-29-2012
Merge two columns from two files into one if another column matches

I have two text files that look something like this:

Code:
A:B:C 123
D:E:F 234
G:H:I 345
J:K:L 123
M:N:O 456
P:Q:R 567

Code:
A:B:C 456
D:E:F 567
G:H:I 678
J:K:L 456
M:N:O 789
P:Q:R 890

I want to find the line where the first column matches and then combine the second columns into a single column so the output looks like this:

Code:
A:B:C 123456
D:E:F 234567
G:H:I 345678
J:K:L 123456
M:N:O 456789
P:Q:R 567890

After that, I want to search through the second columns and remove duplicate ones. In this case, that would mean the A:B:C line and the J:K:L line have matching second columns, so I would remove the J:K:L line.

Code:
A:B:C 123456
D:E:F 234567
G:H:I 345678
M:N:O 456789
P:Q:R 567890

I've tried some awk, but I am not coming anywhere close with this one. Smilie The files can also get pretty big with hundreds of millions of lines, so a speedier option would be best. Thanks!
 

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Locale::Codes::LangFam(3pm)				 Perl Programmers Reference Guide			       Locale::Codes::LangFam(3pm)

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 v5.18.2 2013-11-04 Locale::Codes::LangFam(3pm)
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