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Re: Equivalent of ksh, zsh {N}<[WORD] ?


From: Pierre Gaston
Subject: Re: Equivalent of ksh, zsh {N}<[WORD] ?
Date: Tue, 26 Aug 2008 17:14:43 +0300

On Tue, Aug 26, 2008 at 4:49 PM, R. Bernstein <address@hidden> wrote:
> Pierre Gaston writes:
>  > On Tue, Aug 26, 2008 at 5:41 AM, R. Bernstein <address@hidden> 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???




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