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


From: R. Bernstein
Subject: Re: Equivalent of ksh, zsh {N}<[WORD] ?
Date: Tue, 26 Aug 2008 09:49:35 -0400

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? 




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