in reply to modules as variables

To 'use' a module provided as argument on the commandline, you have to wrap it into a string eval: 
#!/usr/bin/perl
use strict;
use warnings;

BEGIN {
    eval "use $ARGV[0]";
    die $@ if $@;
    shift;           # take first arg out of @ARGV
}

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because saying use $var with $var holding a package name is not possible.

--shmem 

_($_=" "x(1<<5)."?\n".q·/)Oo.  G°\        /
                              /\_¯/(q    /
----------------------------  \__(m.====·.(_("always off the crowd"))."·
");sub _{s./.($e="'Itrs `mnsgdq Gdbj O`qkdq")=~y/"-y/#-z/;$e.e && print}

In Section Seekers of Perl Wisdom