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Full Discussion: Unix "look" Command "File too large" Error Message
Top Forums UNIX for Dummies Questions & Answers Unix "look" Command "File too large" Error Message Post 302516099 by jim mcnamara on Thursday 21st of April 2011 04:00:32 PM
Old 04-21-2011
Assuming your file is sorted and has some reasonablly high H value (the leading characters change) try some kind of a radix split to get small files.

For this example assume that most of the letters of the alphabet are found as the leading character of a record and they are all uppercase. This means you can have ~26 smaller files, all of which look will work on.

Code:
awk {file=substr($0,1,1); print $0 > file}' bigfile

This will create 26 smaller files all named A, B, C ... Z. So, now your command becomes:
Code:
string="String value"
look "$string"  ${string:0:1}

${string:0:1} evalautes to the first letter of the search string, which is the file name.
 

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LEARN ABOUT DEBIAN

file::homedir::unix

File::HomeDir::Unix(3pm)				User Contributed Perl Documentation				  File::HomeDir::Unix(3pm)

NAME

       File::HomeDir::Unix - Find your home and other directories on legacy Unix

SYNOPSIS

	 use File::HomeDir;

	 # Find directories for the current user
	 $home	  = File::HomeDir->my_home;	   # /home/mylogin
	 $desktop = File::HomeDir->my_desktop;	   # All of these will...
	 $docs	  = File::HomeDir->my_documents;   # ...default to home...
	 $music   = File::HomeDir->my_music;	   # ...directory
	 $pics	  = File::HomeDir->my_pictures;    #
	 $videos  = File::HomeDir->my_videos;	   #
	 $data	  = File::HomeDir->my_data;	   #

DESCRIPTION

       This module provides implementations for determining common user directories.  In normal usage this module will always be used via
       File::HomeDir.

SUPPORT

       See the support section the main File::HomeDir module.

AUTHORS

       Adam Kennedy <adamk@cpan.org>

       Sean M. Burke <sburke@cpan.org>

SEE ALSO

       File::HomeDir, File::HomeDir::Win32 (legacy)

COPYRIGHT

       Copyright 2005 - 2011 Adam Kennedy.

       Some parts copyright 2000 Sean M. Burke.

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

       The full text of the license can be found in the LICENSE file included with this module.

perl v5.14.2							    2012-01-25						  File::HomeDir::Unix(3pm)
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