Re: Do `>& -` and `<& -` also work?

[Chet Ramey]

On 5/14/21 10:46 AM, Koichi Murase wrote:

> > > or « exec 4>&$fd- », in
> > > which the file descriptor and - are clearly not the part of the
> > > redirection operator.
> >
> > Bash can know a problem for this case.
>
> Oh, OK. Thank you. I didn't know we can't write in this way.

You can, but $fd has to expand to a number. This operator is used to
move file descriptors.

https://lists.gnu.org/archive/html/help-bash/2021-05/msg00062.html

--
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU    chet@case.edu    http://tiswww.cwru.edu/~chet/