On Fri, Oct 31, 2008 at 14:18, Clark J. Wang <[EMAIL PROTECTED]> wrote:
> Hi, all: > > When I was doing some testing I found the file descriptor 10 is always > duplicate of fd 0 and it cannot be closed. > > See the following commands: > > # echo $BASH_VERSION > 3.2.39(1)-release > # read line <&10 > hello <--- input from keyboard > # echo $line > hello > # exec 10<&- <--- try to close fd 10 > # read line <&10 <--- no error reported, so fd 10 is still open? > hello <--- input from keyboard > # echo $line > hello > # read line <&11 <--- test with fd 11 > bash: 11: Bad file descriptor > # > And, even though we can read from fd 10 but there's no such an fd under /proc/$$/fd directory.
