<> is a nicer name for readline. In scalar context, which is the case of your code, it reads one line from the input. If you do not assign the returned value to a variable, the line is skipped.
لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ

In reply to Re: command line perl reading from STDIN by choroba
in thread command line perl reading from STDIN by perlhappy

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