You can do something as simple as convert your password to hex, then convert it back. Or this nice uuencode method

#!/usr/bin/perl
use warnings;
use strict;
#by fokat of perlmonks

my $string = 'justanotherperlhacker';
print "$string\n";

my $obscure =  pack("u",$string);
print "$obscure\n";

my $unobscure = unpack(chr(ord("a") + 19 + print ""),$obscure);

print "$unobscure\n";
[download]

Or if you need deeper security, encrypt it with any a of various modules, then base64encode it into a string. In the script, send the encoded password to a sub, and return the decoded. That way, unless they are hacker-savvy enough to put in a print statement, no one should actually see the password in plain decoded text.