Re: daemons, sockets and ssh

www.isp2dial.com wrote:

Use

</dev/null >/dev/null 2>&1


That makes sense.


or

<>/dev/null >&0 2>&1


But does it ever make sense to have 0 open for writing, or 1 and 2
open for reading?

It's very common. For example, a terminal session is usually set up by
opening the terminal on fd 0 read/write and then duping it onto 1 and 2.

The "more" utility actually takes advantage of this. If you execute

ls -l | more

on a terminal then "more" can't read its interactive commands (space
for the next page, etc.) from fd 0, so it first tries to read them
from fd 2. It will only resort to opening /dev/tty if fd 2 is
unreadable.

--
Geoff Clare <netnews@xxxxxxxxxxxxx>
.

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