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Full Discussion: sort and uniq in perl
Top Forums Shell Programming and Scripting sort and uniq in perl Post 302073821 by cbkihong on Thursday 18th of May 2006 02:09:42 AM
Old 05-18-2006
That's not complicated, but of course that needs some code.

A hash in perl is good for filtering identical items by using hash keys. Then you can also use sort() to sort the items.

An example:

Code:
@array = ('Apple', 'Orange', 'Apple', 'Banana');
%hashTemp = map { $_ => 1 } @array;
@array_out = sort keys %hashTemp;
# @array_out contains ('Apple', 'Banana', 'Orange')

 

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Cz::Sort(3pm)						User Contributed Perl Documentation					     Cz::Sort(3pm)

NAME
Cz::Sort - Czech sort SYNOPSIS
use Cz::Sort; my $result = czcmp("_x j&a", "_&p"); my @sorted = czsort qw(plachta plaoka Planieka planieka plani); print "@sorted "; DESCRIPTION
Implements czech sorting conventions, indepentent on current locales in effect, which are often bad. Does the four-pass sort. The idea and the base of the conversion table comes from Petr Olsak's program csr and the code is as compliant with CSN 97 6030 as possible. The basic function provided by this module, is czcmp. If compares two scalars and returns the (-1, 0, 1) result. The function can be called directly, like my $result = czcmp("_x j&a", "_&p"); But for convenience and also because of compatibility with older versions, there is a function czsort. It works on list of strings and returns that list, hmm, sorted. The function is defined simply like sub czsort { sort { czcmp($a, $b); } @_; } standard use of user's function in sort. Hashes would be simply sorted @sorted = sort { czcmp($hash{$a}, $hash{$b}) } keys %hash; Both czcmp and czsort are exported into caller's namespace by default, as well as cscmp and cssort that are just aliases. This module comes with encoding table prepared for ISO-8859-2 (Latin-2) encoding. If your data come in different one, you might want to check the module Cstocs which can be used for reencoding of the list's data prior to calling czsort, or reencode this module to fit your needs. VERSION
0.68 SEE ALSO
perl(1), Cz::Cstocs(3). AUTHOR
(c) 1997--2000 Jan Pazdziora <adelton@fi.muni.cz>, http://www.fi.muni.cz/~adelton/ at Faculty of Informatics, Masaryk University, Brno perl v5.10.1 2000-05-16 Cz::Sort(3pm)
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