04-21-2010
For the command line switches, see
perldoc perlrun. -W enables warnings (possible typos), -e tells Perl to use the first argument as a stand-alone script ("oneliner").
For the "diamond operator", see
perldoc perlop:
Quote:
The null filehandle <> is special: it can be used to emulate the behavior of sed and awk. Input from <> comes either from standard input, or from each file listed on the command line
When evaluated in a list context, it returns all the lines at once. Those are then fed into sort.
sort can be invoked in 3 forms: without a special argument, it will do regular alphanumerical sorting, depending on your locale. Alternatively, you can specify your own routing as a code block or a sub. Inside this code block, $a and $b refer to the left and right side of the comparison. From each I extract the digit(s) after the dash, and do a numerical comparison using the <=> operator.
Finally, the resulting, sorted, list is printed again.
It could also have been done using the
Schwartzian transform, but 2 additional
maps would improve nothing, and might even slow it down.
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LEARN ABOUT CENTOS
net::ldap::control::sort
Net::LDAP::Control::Sort(3) User Contributed Perl Documentation Net::LDAP::Control::Sort(3)
NAME
Net::LDAP::Control::Sort - Server Side Sort (SSS) control object
SYNOPSIS
use Net::LDAP::Control::Sort;
use Net::LDAP::Constant qw(LDAP_CONTROL_SORTRESULT);
$sort = Net::LDAP::Control::Sort->new(
order => "cn -phone"
);
$mesg = $ldap->search( @args, control => [ $sort ]);
($resp) = $mesg->control( LDAP_CONTROL_SORTRESULT );
print "Results are sorted
" if $resp and !$resp->result;
DESCRIPTION
"Net::LDAP::Control::Sort" is a sub-class of Net::LDAP::Control. It provides a class for manipulating the LDAP Server Side Sort (SSS)
request control 1.2.840.113556.1.4.473 as defined in RFC-2891
If the server supports sorting, then the response from a search operation will include a sort result control. This control is handled by
Net::LDAP::Control::SortResult.
CONSTRUCTOR ARGUMENTS
order
A string which defines how entries may be sorted. It consists of multiple directives, spearated by whitespace. Each directive describes
how to sort entries using a single attribute. If two entries have identical attributes, then the next directive in the list is used.
Each directive specifies a sorting order as follows
-attributeType:orderingRule
The leading "-" is optional, and if present indicates that the sorting order should be reversed. "attributeType" is the attribute name
to sort by. "orderingRule" is optional and indicates the rule to use for the sort and should be valid for the given "attributeType".
Any one attributeType should only appear once in the sorting list.
Examples
"cn" sort by cn using the default ordering rule for the cn attribute
"-cn" sort by cn using the reverse of the default ordering rule
"age cn" sort by age first, then by cn using the default ordering rules
"cn:1.2.3.4" sort by cn using the ordering rule defined as 1.2.3.4
METHODS
As with Net::LDAP::Control each constructor argument described above is also available as a method on the object which will return the
current value for the attribute if called without an argument, and set a new value for the attribute if called with an argument.
SEE ALSO
Net::LDAP, Net::LDAP::Control::SortResult, Net::LDAP::Control, http://www.ietf.org/rfc/rfc2891.txt
AUTHOR
Graham Barr <gbarr@pobox.com>
Please report any bugs, or post any suggestions, to the perl-ldap mailing list <perl-ldap@perl.org>
COPYRIGHT
Copyright (c) 1999-2004 Graham Barr. All rights reserved. This program is free software; you can redistribute it and/or modify it under the
same terms as Perl itself.
perl v5.16.3 2013-06-07 Net::LDAP::Control::Sort(3)