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Full Discussion: How to grep a number in a file to find them in another file
Top Forums Shell Programming and Scripting How to grep a number in a file to find them in another file Post 302150553 by drl on Tuesday 11th of December 2007 07:12:17 PM
Old 12-11-2007
Hi.

Some of the initial complexity can be removed by using command join:
Code:
#!/usr/bin/env sh

# @(#) s1       Demonstrate a join, using a field different from 1.

set -o nounset
echo

debug=":"
debug="echo"

## Use local command version for the commands in this demonstration.

echo "(Versions displayed with local utility \"version\")"
version >/dev/null 2>&1 && version bash my-nl join

echo
echo " Input files:"
cat data1
echo
cat data2

echo
echo " Result of join:"
join -1 2 data1 data2

exit 0

Producing:
Code:
% ./s1

(Versions displayed with local utility "version")
GNU bash 2.05b.0
my-nl (local) 296
join (coreutils) 5.2.1

 Input files:
aaa 107
bbb 108
ccc 109

101 2 1
102 3 1
107 2 1
108 3 1
109 2 1

 Result of join:
107 aaa 2 1
108 bbb 3 1
109 ccc 2 1

You may still wish to use awk for the post-join processing, because that makes it easy to use the resulting fields. See man pages for details ... cheers, drl
 

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LEARN ABOUT CENTOS

cpanplus::shell

CPANPLUS::Shell(3)					User Contributed Perl Documentation					CPANPLUS::Shell(3)

NAME

       CPANPLUS::Shell - base class for CPANPLUS shells

SYNOPSIS

	   use CPANPLUS::Shell; 	    # load the shell indicated by your
					    # config -- defaults to
					    # CPANPLUS::Shell::Default

	   use CPANPLUS::Shell qw[Classic]  # load CPANPLUS::Shell::Classic;

	   my $ui      = CPANPLUS::Shell->new();
	   my $name    = $ui->which;	    # Find out what shell you loaded

	   $ui->shell;			    # run the ui shell

DESCRIPTION

       This module is the generic loading (and base class) for all "CPANPLUS" shells. Through this module you can load any installed "CPANPLUS"
       shell.

       Just about all the functionality is provided by the shell that you have loaded, and not by this class (which merely functions as a generic
       loading class), so please consult the documentation of your shell of choice.

BUG REPORTS

       Please report bugs or other issues to <bug-cpanplus@rt.cpan.org<gt>.

AUTHOR

       This module by Jos Boumans <kane@cpan.org>.

COPYRIGHT

       The CPAN++ interface (of which this module is a part of) is copyright (c) 2001 - 2007, Jos Boumans <kane@cpan.org>. All rights reserved.

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

SEE ALSO

       CPANPLUS::Shell::Default, CPANPLUS::Shell::Classic, cpanp

perl v5.16.3							    2013-05-20							CPANPLUS::Shell(3)
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