03-26-2004
super quick and dirty way is use the space as your seperator and load each element into a hash.
hashes can only contain unique keys. so if you load up a hash then you are sure to get no duplicates.
then you just spit out each key and reform your line.
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LEARN ABOUT REDHAT
tie::refhash
Tie::RefHash(3pm) Perl Programmers Reference Guide Tie::RefHash(3pm)
NAME
Tie::RefHash - use references as hash keys
SYNOPSIS
require 5.004;
use Tie::RefHash;
tie HASHVARIABLE, 'Tie::RefHash', LIST;
tie HASHVARIABLE, 'Tie::RefHash::Nestable', LIST;
untie HASHVARIABLE;
DESCRIPTION
This module provides the ability to use references as hash keys if you first "tie" the hash variable to this module. Normally, only the
keys of the tied hash itself are preserved as references; to use references as keys in hashes-of-hashes, use Tie::RefHash::Nestable,
included as part of Tie::RefHash.
It is implemented using the standard perl TIEHASH interface. Please see the "tie" entry in perlfunc(1) and perltie(1) for more informa-
tion.
The Nestable version works by looking for hash references being stored and converting them to tied hashes so that they too can have refer-
ences as keys. This will happen without warning whenever you store a reference to one of your own hashes in the tied hash.
EXAMPLE
use Tie::RefHash;
tie %h, 'Tie::RefHash';
$a = [];
$b = {};
$c = *main;
$d = "gunk";
$e = sub { 'foo' };
%h = ($a => 1, $b => 2, $c => 3, $d => 4, $e => 5);
$a->[0] = 'foo';
$b->{foo} = 'bar';
for (keys %h) {
print ref($_), "
";
}
tie %h, 'Tie::RefHash::Nestable';
$h{$a}->{$b} = 1;
for (keys %h, keys %{$h{$a}}) {
print ref($_), "
";
}
AUTHOR
Gurusamy Sarathy gsar@activestate.com
VERSION
Version 1.30
SEE ALSO
perl(1), perlfunc(1), perltie(1)
perl v5.8.0 2002-06-01 Tie::RefHash(3pm)