this is a job for perl :) make a entry in /bin call Perl. this assumes that you have symbolic links to /bin/perl that point to the version your testing. #!/usr/bin/perl #/usr/bin/Perl if ($] > 5.005) { $ENV{'PERL5LIB'} =~ s/^/\/p\/perl\/lib\/site_perl\/5.6:/; } exec '/usr/bin/perl' , @ARVG;