: ${TMPDIR:=/tmp}

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

rm -f $TMPDIR/foo

echo hey > $TMPDIR/foo
func &>> $TMPDIR/foo

cat $TMPDIR/foo

echo
func &> $TMPDIR/foo

cat $TMPDIR/foo

echo
func >$TMPDIR/foo
cat $TMPDIR/foo

echo
echo hey > $TMPDIR/foo
func >> $TMPDIR/foo
cat $TMPDIR/foo

rm -f $TMPDIR/foo

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

type logfunc

echo foo 2>&1

bix()
{
echo foo |& cat
}

type bix

bix