DEVICE=""; ONBOOT=""; USERS=""; . "$i" 2>/dev/null
[ "${DEVICE:+set}" != "set" ] && continue
[ ${USERS:-no} != no ] && continue
DEVICE=""; ONBOOT=""; USERS=""; . "$i" 2>/dev/null
[ "${DEVICE:+set}" != "set" ] && continue
[ ${USERS:-no} != no ] && continue