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Full Discussion: Select only the lines of a file starting with a field which is matcing a list. awk?
Top Forums Shell Programming and Scripting Select only the lines of a file starting with a field which is matcing a list. awk? Post 302916828 by pilnet101 on Friday 12th of September 2014 05:57:03 AM
Old 09-12-2014
Sure.

The first part of the code
Code:
awk 'FNR==NR{m[$1]++;next}

is reading and storing the contents of $1 from file2 into an array called m. So this will be made up of all the 2014* values.

The second part of the code
Code:
/^2/{x=($1 in m)}x'

is what is run for each line in file1. It basically says for each line beginning with a 2 (I made the assumption from the data provided by OP that each value in file2 would start with 2014, so in effect this can be elaborated to /^2014/ OR /^201/), check to see if this 2014* value (ie. $1) is in the array m. Set x to the return code of the 'in array' function which will exit 1 if true and 0 is false. Then pass x outside the action block to perform the default action of printing the line, when x is not 0.

Hope this helps, sorry if I have confused things more!
This User Gave Thanks to pilnet101 For This Post:
phaethon
 

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LEARN ABOUT MOJAVE

locale::language

Locale::Language(3pm)					 Perl Programmers Reference Guide				     Locale::Language(3pm)

NAME

       Locale::Language - standard codes for language identification

SYNOPSIS

	  use Locale::Language;

	  $lang = code2language('en');	      # $lang gets 'English'
	  $code = language2code('French');    # $code gets 'fr'

	  @codes   = all_language_codes();
	  @names   = all_language_names();

DESCRIPTION

       The "Locale::Language" module provides access to standard codes used for identifying languages, such as those as defined in ISO 639.

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

SUPPORTED CODE SETS

       There are several different code sets you can use for identifying languages. 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:

	  $lang = code2language('en','alpha-2');
	  $lang = code2language('en',LOCALE_CODE_ALPHA_2);

       The codesets currently supported are:

       alpha-2, LOCALE_LANG_ALPHA_2
	   This is the set of two-letter (lowercase) codes from ISO 639-1, such as 'he' for Hebrew.  It also includes additions to this set
	   included in the IANA language registry.

	   This is the default code set.

       alpha-3, LOCALE_LANG_ALPHA_3
	   This is the set of three-letter (lowercase) bibliographic codes from ISO 639-2 and 639-5, such as 'heb' for Hebrew.	It also includes
	   additions to this set included in the IANA language registry.

       term, LOCALE_LANG_TERM
	   This is the set of three-letter (lowercase) terminologic codes from ISO 639.

ROUTINES

       code2language ( CODE [,CODESET] )
       language2code ( NAME [,CODESET] )
       language_code2code ( CODE ,CODESET ,CODESET2 )
       all_language_codes ( [CODESET] )
       all_language_names ( [CODESET] )
       Locale::Language::rename_language  ( CODE ,NEW_NAME [,CODESET] )
       Locale::Language::add_language  ( CODE ,NAME [,CODESET] )
       Locale::Language::delete_language  ( CODE [,CODESET] )
       Locale::Language::add_language_alias  ( NAME ,NEW_NAME )
       Locale::Language::delete_language_alias	( NAME )
       Locale::Language::rename_language_code  ( CODE ,NEW_CODE [,CODESET] )
       Locale::Language::add_language_code_alias  ( CODE ,NEW_CODE [,CODESET] )
       Locale::Language::delete_language_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/iso639-2/
	   Source of the ISO 639-2 codes.

       http://www.loc.gov/standards/iso639-5/
	   Source of the ISO 639-5 codes.

       http://www.iana.org/assignments/language-subtag-registry
	   The IANA language subtag registry.

AUTHOR

       See Locale::Codes for full author history.

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

COPYRIGHT

	  Copyright (c) 1997-2001 Canon Research Centre Europe (CRE).
	  Copyright (c) 2001-2010 Neil Bowers
	  Copyright (c) 2010-2013 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							    2014-01-06						     Locale::Language(3pm)
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