1
2set -- 1 2 3 4 5 6 7 8 9 10 11 12 13
3[ "$#" = 13 ] || echo '$# wrong'
4[ "${#}" = 13 ] || echo '${#} wrong'
5[ "${##}" = 2 ] || echo '${##} wrong'
6set --
7[ "$#" = 0 ] || echo '$# wrong'
8[ "${#}" = 0 ] || echo '${#} wrong'
9[ "${##}" = 1 ] || echo '${##} wrong'
10