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Top Forums Shell Programming and Scripting Perl how to move pointer to previous line in a txt file? Post 302161469 by KevinADC on Thursday 24th of January 2008 06:51:27 PM
Old 01-24-2008
If Smiling_Dragons suggestion does not work, you can use the Tie::File module, which allows you to read and write to a file just like a perl array. See the Tie::File documentation for usage details. It's also a core module so you should have it installed already. If you get stuck, post back.
 

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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 information. The Nestable version works by looking for hash references being stored and converting them to tied hashes so that they too can have references 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{$a}}) { print ref($_), " "; } THREAD SUPPORT
Tie::RefHash fully supports threading using the "CLONE" method. STORABLE SUPPORT
Storable hooks are provided for semantically correct serialization and cloning of tied refhashes. RELIC SUPPORT
This version of Tie::RefHash seems to no longer work with 5.004. This has not been throughly investigated. Patches welcome ;-) LICENSE
This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself MAINTAINER
Yuval Kogman <nothingmuch@woobling.org> AUTHOR
Gurusamy Sarathy gsar@activestate.com 'Nestable' by Ed Avis ed@membled.com SEE ALSO
perl(1), perlfunc(1), perltie(1) perl v5.16.2 2012-10-11 Tie::RefHash(3pm)
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