My eyes could be playing me tricks again but I think your

die $help unless $ARGV[1];

[download]

and it's previous incarnations will die erroneously if the user wants to sum from, say, -7 to 0. Perhaps unless defined $ARGV[1]; would be better?

Cheers,

JohnGG

In reply to Re^5: a simple exercise in readability by johngg
in thread a simple exercise in readability by apotheon

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