: ${TMPDIR:=/tmp}

func()
{
	echo "to stdout"
	echo "to stderr" >&2
}

TMPFN=$TMPDIR/foo-$$

rm -f $TMPFN

echo hey > $TMPFN
func &>> $TMPFN

cat $TMPFN

echo
func &> $TMPFN

cat $TMPFN

echo
func >$TMPFN
cat $TMPFN

echo
echo hey > $TMPFN
func >> $TMPFN
cat $TMPFN

rm -f $TMPFN

logfunc()
{
	echo "$@" &>> $TMPDIR/log
}

type logfunc

echo foo 2>&1

bix()
{
echo foo |& cat
}

type bix

bix