The $| = 1; line tells Perl to shut off its buffering;

A bit of a nit, but Perl isn't doing the buffering and setting $|=1 doesn't turn off any buffering. C's stdio library is doing the buffering and $|=1 tells Perl to issue an fflush() after each statement that writes to that file handle (the output handle that was selected when $| was modified).

Some consequences of this are that STDERR is (at least usually) not buffered even though: 

select(STDERR);
print $|;

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prints "0" by default. Also, STDOUT is usually "line buffered" when going to an interactive terminal (the buffer gets flushed by the C RTL whenever a newline is found) but is usually "block buffered" (a fixed-length buffer is used and data is only flushed to the file when that buffer fills) when redirected to a file.

        - tye (but my friends call me "Tye")

In reply to (tye)Re: print sleep print by tye
in thread print sleep print by Anonymous Monk

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