07-15-2008
what u can do is use hash in perl
1. open file in read mode
2. use regex to get filed after "User Id:"
3. put this "user Id" as key in Hash if not present
4. every time you find user present increase key value by 1
5. at the end sort keys of hash and do print.
following link might help
Perl Hash Howto
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LEARN ABOUT DEBIAN
hash::case::lower
Hash::Case::Lower(3pm) User Contributed Perl Documentation Hash::Case::Lower(3pm)
NAME
Hash::Case::Lower - hash with enforced lower cased keys
INHERITANCE
Hash::Case::Lower
is a Hash::Case
is a Tie::StdHash
SYNOPSIS
use Hash::Case::Lower;
tie my(%lchash), 'Hash::Case::Lower';
$lchash{StraNGeKeY} = 3;
print keys %lchash; # strangekey
DESCRIPTION
Hash::Case::Lower extends Hash::Case, which lets you play various trics with hash keys. In this implementation, the fake hash is case
insensitive and the keys stored in lower-case.
METHODS
Constructors
$obj->addHashData(HASH)
See "Constructors" in Hash::Case
$obj->addPairs(PAIRS)
See "Constructors" in Hash::Case
$obj->setHash(HASH)
See "Constructors" in Hash::Case
tie(HASH, 'Hash::Case::Lower', [VALUES,] OPTIONS)
Define HASH to have only lower cased keys. The hash is initialized with the VALUES, specified as ref-array (with key value pairs) or
ref-hash. Currently, there are no OPTIONS defined.
SEE ALSO
This module is part of Hash-Case distribution version 1.02, built on March 09, 2012. Website: http://perl.overmeer.net/hash-case/
LICENSE
Copyrights 2002-2003,2007-2012 by Mark Overmeer. For other contributors see ChangeLog.
This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. See
http://www.perl.com/perl/misc/Artistic.html
perl v5.14.2 2012-03-09 Hash::Case::Lower(3pm)