On Tue, Aug 26, 2008 at 4:49 PM, R. Bernstein <[EMAIL PROTECTED]> wrote:
> Pierre Gaston writes:
> > On Tue, Aug 26, 2008 at 5:41 AM, R. Bernstein <[EMAIL PROTECTED]> wrote:
> > > Both zsh and ksh have a way to open a file or duplicate a file
> > > descriptor and let the interpreter pick the descriptor saving the
> > > newly-allocated file descriptor number in a variable. In particular:
> > >
> > > exec {fd}<&0
> > >
> > > will duplicate stdin and save the newly allocated file-descriptor
> > > number to fd. Also:
> > >
> > > exec {fd}<filename
> > >
> > > opens filename with a new file descriptor and saves the number
> > > allocated in fd. Short of going outside of the language and using
> > > lsof, /proc, or the processes table, I haven't been able to figure out
> > > how to do the corresponding thing in bash. Is there a way?
> > >
> > > If not, it would be great if a future version had this extension that
> > > zsh and ksh both seem to have.
> > >
> > > Thanks!
> >
> > This is a standard behaviour and you can do this in pretty much any
> > shell out there, including bash.
>
> Really? It doesn't seem to be documented in bashref. And when I tried just
> a moment ago:
>
> $ {fd}<&0
> {fd}<&0
> bash: {fd}: command not found
> $ bash --version
> bash --version
> GNU bash, version 3.2.39(1)-release (i486-pc-linux-gnu)
>
> Perhaps you are thinking of the variation without braces?
>
well, I was thinking of the normal redirection syntax:
exec 3<&0
I doubt '{fd}<&0' is meaningfull anywhere.....in ksh {fd} tries to
run the command {fd} like in bash
in zsh it tries to run the command "fd"
What are you talking about???
