Your standalone program is buffering its output. Try setting $|=1; (update: in the printing program!) before printing anything. $| has no effect on reading, only on output.

"What should it profit a man, if he should win a flame war, yet lose his cool?"

In reply to Re^3: print output from system command in real time by Joost
in thread print output from system command in real time by Anonymous Monk

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