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use strict;
use warnings;
...
        print "But I don't know what I saw\n";
    }
}

C:\>test.pl --something NodeReaper
I saw something on the cmd line
And it was NodeReaper

C:\>test.pl --something
I saw something on the cmd line
But I don't know what I saw

C:\>test.pl --something a -something grue
I saw something on the cmd line
And it was a grue