<petpeeve>THERE SHALL NEVER BE AN ELSE AFTER EXIT OR RETURN!!!</petpeeve>

my $wordlist = 'wordlist.txt';    

if (! -s $wordlist) {
    print "File is empty\n";
    exit 0;
    }
# NO ELSE HERE!
# your code goes here
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An else is only useful if code is executed after the if/else for BOTH branches. As the first branch is exiting, the "common" code is never executed and the else is only causing unneeded clutter indent and might confuse the reader.