What program? Is it something you wrote or something you got somewhere else?

It's possible that everything is working fine, if you're running a program that does not produce output. I can't imagine why a program would produce no output if it was meant to be run from the command line, but it's possible. And if you're new to Perl and writing a simple program, you might just have forgotten to write anything, or perhaps are accidentally writing a blank variable. For example, this would produce no output without telling me I'd done something wrong due to my failure to use strict and use warnings:

#!/usr/bin/perl

my $Nothing = "Hello World\n";
print $nothing;
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Maybe try a simple test, like running

 perl -e 'print "Hello!\n";'
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