Bash-1.14.4 has a bug with variable name expansion.
On my SCO Unix 3.2v4.0 system, this script fails with bash-1.14.4,
but works with bash-1.14.3, bash-1.13.1, /bin/sh and /bin/ksh.

William Bader
work:  610-837-8485
home:  610-868-1311
email: wbader@pluto.csee.lehigh.edu, william@nscs.fast.net
note:  replies to wbader@csee.lehigh.edu without pluto sometimes bounce

------------------------------------------------------------

tool_var() {
	eval $1=\"\${$1:-$2}\"
	export $1
}

A="aaa bbb ccc"

unset B

tool_var	B	${B:-"$A"}

echo "Result is $B"

if [ "$A" = "$B" ]
then
	echo "OK"
else
	echo "Error, expected $A"
fi