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From: gwyn@brl-tgr.ARPA (Doug Gwyn <gwyn>)
Newsgroups: net.unix
Subject: Re: redirecting stdin in ksh
Message-ID: <1750@brl-tgr.ARPA>
Date: Sun, 19-Jan-86 18:54:00 EST
Article-I.D.: brl-tgr.1750
Posted: Sun Jan 19 18:54:00 1986
Date-Received: Thu, 23-Jan-86 20:37:42 EST
References: <235@mtuni.UUCP>
Distribution: net
Organization: Ballistic Research Lab
Lines: 15

> exec 3<&0 < file	# dup stdin to fd 3, and redirect from file
> while [ "$more" ]
> do
> 	read number age name
> 	if [ "$?" -eq 0 ]
> 	then
> 		process number, age, name
> 	else 	# end of file
> 		more=""
> 	fi
> done
> exec 0<&3 3<&-		# redirect stdin back to fd 0, close fd 3

My guess is that ksh closed down all fds other than 0,1,2
when execing a command inside the loop.