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title: Using Nagios::Plugin
parent: FAQ
---
# How do I use the Nagios::Plugin module?
The Nagios::Plugin Perl module can be obtained from two main locations:
* from the Nagios Plugins tarball with an
[extra configure option][configure-module]
* from [CPAN][cpan-module]
If you install from the Nagios Plugins tarball, the Perl module will be
installed in `$prefix/perl`.
If you install from CPAN, the Perl module will be installed into your Perl's
system directories by default.
To write your plugin, you should start it with:
use FindBin;
use lib "$FindBin::Bin/../perl/lib";
use Nagios::Plugin;
This bit of code tells Perl to look for the Nagios::Plugin module in a
directory relative to where the plugin is executed - this is a hard
dependency. If Nagios::Plugin is not found there, Perl's system directories
will be searched.
This approach allows a system administrator to decide whether they want
Nagios::Plugin installed via system directories or within the `$prefix` area
of the plugins.
[configure-module]: doc/faq/build-perl-module.html "configure with Nagios::Plugin"
[cpan-module]: http://search.cpan.org/dist/Nagios-Plugin/ "Nagios::Plugin on CPAN"
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