More Special Variables in Perl: Outputs

Keep It Moving

$| If this is set to a non-zero value, it forces an immediate buffer flush, and then a flush after every write or print. The default is zero, which means some buffering is done. If you're writing to a file, you're not likely to be too worried about this, but if you're writing to a pipe or a socket, you may want to be sure your output doesn't wait around.

$, This variable sets what print outputs between the elements that are passed in to it. By default it's undefined. So, this code:

print "1", "2", "3", "n";
{
        local $, = " ";
        print "1", "2", "3", "n";
}

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