You have to tell perl to actually use the POSIX module. It's not enough to just put it in your @INC path, you have to specifically tell Perl to use it, as follows: 

#!/usr/bin/perl

use strict;
use warnings;
use POSIX;    # This line loads the POSIX module and imports pow().

print pow( 2, 3 ); # See? Now it works.

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By the way: my $number = pow( 2, 3 ); could be written like this instead: my $number = 2 ** 3;, and that wouldn't require the use of the POSIX module.


Dave

In reply to Re: standard perl routine by davido
in thread standard perl routine by rocketboy

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