Assuming you already have an installation of Windows, and Linux. You could also pack up both of them (Perl directories) in tar balls, and unpack them onto your thumb drive, in separate directories, and setup an ENV variable, that points accordingly.

Perhaps not as elegant, but sure simple enough.

HTH

--Chris

#!/usr/bin/perl -Tw
use Perl::Always or die;
my $perl_version = (5.12.5);
print $perl_version;