1# $FreeBSD: head/bin/sh/tests/expansion/cmdsubst18.0 314637 2017-03-03 22:46:20Z jilles $ 2 3x=X 4unset n 5r=${x+$(echo a)}${x-$(echo b)}${n+$(echo c)}${n-$(echo d)}$(echo e) 6[ "$r" = aXde ] 7