How to install perl packages programatically

That depends on the installation mechanism you are using. I dare say, that CPAN is most widely used, but ActivePerl, for instance, comes with its own module installation mechanism.

For CPAN use this module (see code snippet below):
http://search.cpan.org/~andk/CPAN-1.9304/lib/CPAN.pm

Note: Depending on the system and how perl is set up, the installation of perl modules might require root/admin-rights.

use CPAN;
CPAN::Shell->install("Acme::Meta");
CPAN::Shell->install("NWCLARK/Acme-Meta-0.02.tar.gz");

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Actually my requirement is like this,
actually i have to install some perl packages in a server system,but that server system does not have internet connection.
i have all the .tar.gz files of the required packages.
i need something like when i run a perl script it has to install all the .tar.gz what all are .tar.gz files i provided.