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Date: Tue, 19 Sep 1995 17:12:13 -0700
From: Scott Blachowicz <scott@sabami.seaslug.org>
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Subject: bin/728: problem with /bin/sh quoting
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>Number:         728
>Category:       bin
>Synopsis:       /bin/sh messes up quoting when going through eval
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Tue Sep 19 17:20:00 PDT 1995
>Last-Modified:
>Originator:     Scott Blachowicz
>Organization:
none
>Release:        FreeBSD 2.0-BUILT-19950603 i386
>Environment:

	FreeBSD 2.0.5 from the Walnut Creek CDROM.

>Description:

   /bin/sh has a problem with quoting in something like this sample
   case (distilled down from a more complicated script that I've used for
   years on various OSs):

	x2=XX
	n=2
	t=`eval echo \\\$x$n`
	echo $t

   On everything (HPUX, SunOS, Solaris, IRIX, AIX, DEC OSF1) except
   FreeBSD, that produces 'XX' as output. FreeBSD gives '2' as the
   output.

>How-To-Repeat:

Put these lines in a file (e.g. "test-quoting"):

	#! /bin/sh
	x2=XX
	n=2
	t=`eval echo \\\$x$n`
	echo $t

Season with a little execute permission.

	chmod a+x test-quoting

Then run

	./test-quoting

If it outputs "XX", then it's acting as I expect it to. If it outputs "2"
then it isn't.

>Fix:
	
   [WORKAROUND]

   If a bit of redirection is introduced for the dollar sign:

	d='$'
	t=`eval echo ${d}x$n`

   then it works.


>Audit-Trail:
>Unformatted: