Brian Candler
4/6/2007 7:22:00 AM
On Fri, Apr 06, 2007 at 03:29:12PM +0900, Sonny Chee wrote:
> I know I can do a $stdout.reopen and redirect it to a file.
Note that STDOUT is tied to the underlying operating system's concept of
"standard output" - for Unix this is the open file on file descriptor 1. So
if you *reopen* $stdout (or STDOUT) you'll change what fd 1 points at. Then,
anything else which writes directly to fd 1 - e.g. C extensions, or external
programs run using system() or exec() - will also write to this file.
Now, you can change the global variable $stdout to point to a different IO
object. In that case, anything in Ruby which does "$stdout.puts" will write
to that new object. But anything which writes directly to fd 1 will still be
writing to whatever the OS has attached to fd 1.
Regards,
Brian.