On Thursday 10 September 2009 11:17:33 Tariq Doukkali wrote:
> Hi,
>
> i can not understand, what does this code:
>
>
> $| = 1;
>
$| is a special variable. Reading its description from perldoc perlvar:
<<<<<<<<<<<<<<<<<
$| If set to nonzero, forces a flush right away and after every
write or print on the currently selected output channel.
Default is 0 (regardless of whether the channel is really
buffered by the system or not; $| tells you only whether you've
asked Perl explicitly to flush after each write). STDOUT will
typically be line buffered if output is to the terminal and
block buffered otherwise. Setting this variable is useful
primarily when you are outputting to a pipe or socket, such as
when you are running a Perl program under rsh and want to see
the output as it's happening. This has no effect on input
buffering. See "getc" in perlfunc for that. See "select" in
perldoc on how to select the output channel. See also
IO::Handle. (Mnemonic: when you want your pipes to be piping
hot.)
>>>>>>>>>>>>>>>>>
What it means is that after you do it, then print will output everything
immediately, without buffering it beforehand.
Hope it helps,
Shlomi Fish
> Thanks
>
--
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Shlomi Fish http://www.shlomifish.org/
Optimising Code for Speed - http://shlom.in/optimise
Chuck Norris read the entire English Wikipedia in 24 hours. Twice.
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