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Date: Sat, 17 Sep 2011 13:21:32 +0100
From: Stephane Chazelas <stephane_chazelas@yahoo.fr>
To: Peter Stephenson <p.w.stephenson@ntlworld.com>
Cc: zsh-users@zsh.org
Subject: Re: {fd}< and compound commands
Message-ID: <20110917122132.GA10108@yahoo.fr>
Mail-Followup-To: Peter Stephenson <p.w.stephenson@ntlworld.com>,
	zsh-users@zsh.org
References: <20110914172148.GA7325@yahoo.fr>
 <20110914200601.72c91f87@pws-pc.ntlworld.com>
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User-Agent: Mutt/1.5.21 (2010-09-15)

2011-09-14 20:06:01 +0100, Peter Stephenson:
[...]
> You need to do:
> 
> local fd
> 
> {
>   exec {fd}<file
> 
>   while read; do
>     ...
>   done <&$fd
> } always {
>   exec {fd}<&-
> }
[...]

Except that if the first exec fails, that might close the wrong
fd.

Maybe:

if command exec {fd}<file; then
  {
    while read <&$fd; do
      ...
    done
  } always {
    exec {fd}<&-
  }
fi

-- 
Stephane