On Linux at least the default buffering for things heading to the screen is buffered on the return. Which is why my interactive example involved sending one character at a time. :-)

UPDATE
It also flushes upon reading from STDIN. These two features make interactive scripts much more reasonable.

In reply to Re (tilly) 3: $++ Does What, Exactly? by tilly
in thread $|++ Does What, Exactly? (was: $++ Does What, Exactly?) by Anonymous Monk

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