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Full Discussion: Extract rows from file based on row numbers stored in another file
Top Forums Shell Programming and Scripting Extract rows from file based on row numbers stored in another file Post 302562067 by shoaibjameel123 on Wednesday 5th of October 2011 09:20:26 PM
Old 10-05-2011
Extract rows from file based on row numbers stored in another file
Hi All,

I have a file which is like this:

rows.dat

Code:
1 2 3 4 5 6
3 4 5 6 7 8
7 8 9 0 4 3
2 3 4 5 6 7
1 2 3 4 5 6

I have another file with numbers like these (numbers.txt):
Code:
1
3
4
5

I want to read numbers.txt file line by line. The extract the row from rows.dat based on the number obtained from numbers.txt, and store in files with names of the rows.

Based on above example, this is what I intend to do:
My first number in numbers.txt is 1, so I create a file 1.num and copy the first row from rows.dat in it.

1.num
Code:
1 2 3 4 5 6

Then I go to second line in numbers.txt and get 3. I create a file 3.num and copy the third row from rows.dat file like this.

3.num
Code:
7 8 9 0 4 3

I keep doing it until the end of numbers.txt file

I have written the code for it, but it is not able to create separate files based on the row number. It copies all rows to another file

Code:
for i in `cat numbers.txt`
do
sed -n "$i p" rows.dat >> op.txt
done

I am doing this in Linux with BASH.
 

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LEARN ABOUT CENTOS

locale::codes::langext

Locale::Codes::LangExt(3)				User Contributed Perl Documentation				 Locale::Codes::LangExt(3)

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) 2011-2013 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::LangExt(3)
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