Yes, exactly what i mean. Is there something happening that i am unaware of?

Far as i understand, keeping tail in the "-f" mode doesn't keep the lines in the memory space nor does perl using while <STDIN> do that, so it should only be a matter of printing a line through external program and seeing if we have another line to print again.

In reply to Re^2: Using pipe and reading from the stdin by mellin
in thread Using pipe and reading from the stdin by mellin

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