#!/usr/bin/perl -w
use strict;
unless ($ARGV[0] eq '-lc' || $ARGV[0] eq '-uc' ){
	die "usage: lcuc [-uc | -lc] file\n";
}

my $op = substr(shift @ARGV, 1, 2);

while(<>){
	no strict 'refs';
	print &{$op}($_)
}

sub lc{ lc shift }
sub uc{ uc shift }