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Full Discussion: Grabbing fields without using external commands
Top Forums Shell Programming and Scripting Grabbing fields without using external commands Post 303008140 by SkySmart on Monday 27th of November 2017 05:47:55 PM
Old 11-27-2017
Grabbing fields without using external commands
data:
Code:
bblah1_blah2_blah3_blah4_blah5
bblahA_blahB_blahC_blahD_blahE

im using the following code to grab the field i want:

Code:
cat data | while IFS='_' read v1 v2 v3 v4 v5; do printf '%s\n' "${v4}"; done

im catting data here. in the real world, the exact content of data will be in a variable. so instead of catting, i'll be doing something like printf '%s\n' "${datacontents}" | while IFS='_' read v1 v2 v3 v4 v5; do printf '%s\n' "${v4}"; done

This works for me. but there are many instances where I have to grab the last field or second to last field. how do i do that using the above command, without having to call any external utilities?

if i was to call an external utility i can grab the last field with this:
Code:
awk -F"_" '{print $NF}' data

and i can get the second to last with i believe this:
Code:
awk -F"_" '{print $(NF-1)}' data

i dont want to use awk or any external utilities. i gave the above examples so that i can be clear in what im asking.

i intend to use this code on across multiple unix platforms so it should be portable.
Last edited by SkySmart; 11-27-2017 at 06:58 PM..
 

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LEARN ABOUT OSX

locale::codes::langext

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

NAME

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

SYNOPSIS

	  use Locale::Codes::LangExt;

	  $lext = code2langext('acm');		       # $lext gets 'Mesopotamian Arabic'
	  $code = langext2code('Mesopotamian Arabic'); # $code gets 'acm'

	  @codes   = all_langext_codes();
	  @names   = all_langext_names();

DESCRIPTION

       The "Locale::Codes::LangExt" module provides access to standard codes used for identifying language extensions, such as those as defined in
       the IANA language registry.

       Most of the routines take an optional additional argument which specifies the code set to use. If not specified, the default IANA language
       registry codes will be used.

SUPPORTED CODE SETS

       There are several different code sets you can use for identifying language extensions. 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 = code2langext('acm','alpha');
	  $lext = code2langext('acm',LOCALE_LANGEXT_ALPHA);

       The codesets currently supported are:

       alpha
	   This is the set of three-letter (lowercase) codes from the IANA language registry, such as 'acm' for Mesopotamian Arabic.

	   This is the default code set.

ROUTINES

       code2langext ( CODE [,CODESET] )
       langext2code ( NAME [,CODESET] )
       langext_code2code ( CODE ,CODESET ,CODESET2 )
       all_langext_codes ( [CODESET] )
       all_langext_names ( [CODESET] )
       Locale::Codes::LangExt::rename_langext  ( CODE ,NEW_NAME [,CODESET] )
       Locale::Codes::LangExt::add_langext  ( CODE ,NAME [,CODESET] )
       Locale::Codes::LangExt::delete_langext  ( CODE [,CODESET] )
       Locale::Codes::LangExt::add_langext_alias  ( NAME ,NEW_NAME )
       Locale::Codes::LangExt::delete_langext_alias  ( NAME )
       Locale::Codes::LangExt::rename_langext_code  ( CODE ,NEW_CODE [,CODESET] )
       Locale::Codes::LangExt::add_langext_code_alias  ( CODE ,NEW_CODE [,CODESET] )
       Locale::Codes::LangExt::delete_langext_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.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) 2011-2012 Sullivan Beck

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

perl v5.16.2							    2012-10-11					       Locale::Codes::LangExt(3pm)
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