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At first sight this behaviour looks very strange. If there was any data available via <>, the command x <> would consume all of it and the loop would not be entered. I've played a bit with this setup and are able to reproduce such a thing. If <> is exhausted and the final returned undef is ignored, the next call to <> will read from STDIN, even if file names were provided via @ARGV.

This behaviour is documented in I/O Operators.

I guess there is some part in the script that ignores an undef return from <> or evaluates it in list context before the loop in question. And there are named files in addition to data from STDIN.


...the loop would not be entered.

This it not true and is not what I wanted to say. The loop is entered, but it will wait for input from STDIN.



In reply to Re^2: Angle operator [updated] by jo37
in thread Angle operator by jerryhone

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