Just according to -X is -t defaulting to STDIN so you could spare a word.
True, but I'd probably have to keep looking that up to remind myself what it's doing. I was actually thinking of spending another char and switching to !-p STDIN since that's a bit more self-documenting.

An alternative approach which seems cleaner to me could be to create an iterator which either implements:
Excellent suggestion! It's both more succinct and understandable. 
my $iter = (@ARGV || -t STDIN) ? sub { shift @ARGV } : sub { <STDIN> }
+;
while (defined(my $in = $iter->())) {
}

[download]

Thanks!

In reply to Re^2: Getting data from either ARGV or STDIN by sleet
in thread Getting data from either ARGV or STDIN by sleet

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