Re: bash leaks sh-np-NNN files and pipes in /tmp/ when command substitution is used

[Yuri]

On 12/11/2013 22:53, Piotr Grzybowski wrote:
>   Yuri: I have verified that under linux 3.2.0, bash-4.2.25, nothing of
> the sort takes place. tee gets/dev/fd/${somefd}, why it is not
> supported in bsd kernel i have no idea, but I thought it was. I've
> even built mplayer and run your script (btw. probably there is an
> easier way of doing what you want), I also performed some tests with
> command that actually outputs what grep looks for. Also please note
> that `command substitution`, or $(command substitution) is slightly
> different from >(process substitution).

Piotr,

/dev/fd/{somefd} is quite an advanced feature, and it can be/has been 
argued that it can lead to unpredictable behavior when file descriptors 
appear/disappear. So  FreeBSD only implements fds 0,1,2. Even those can 
be closed too.
There are some other systems without such feature, and bash should be 
fixed to work fine without it.

Yuri