this could be because of buffering. (perl actually does not send one line at a time; it waits for more FIRST unless you tell it differently).

There is a very excellent and easy to understand explanation at: http://perl.plover.com/FAQs/Buffering.html

Probably what you want is: 

use IO::Handle;
STDOUT->autoflush;

[download]
But do read the FAQ and all will become clear.

In reply to Re: Print the output from the pipe while waiting by halfcountplus
in thread Print the output from the pipe while waiting by Anonymous Monk

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