use strict;
use warnings;

my $file;
while (1) {
    while (1) {
        print "Please enter a file name, or Q to quit.\n";
        chomp($file = <STDIN>);
        exit if uc $file eq 'Q';
        last if $file;
    }
    last if open(FH, $file);
    print "Can't open $file for read.\n";
}
print join '', <FH>;
exit;