1	#!/usr/bin/env bash
2	#
3	# Tests for the blog.
4	#
5	# Fun game: try to come up with an expression that behaves differently on ALL
6	# FOUR shells.
7
8	### ${##}
9	set -- $(seq 25)
10	echo ${##}
11	# stdout: 2
12
13	### ${###}
14	set -- $(seq 25)
15	echo ${###}
16	# stdout: 25
17	# N-I osh stdout-json: ""
18	# N-I osh status: 2
19
20	### ${####}
21	set -- $(seq 25)
22	echo ${####}
23	# stdout: 25
24	# N-I osh stdout-json: ""
25	# N-I osh status: 2
26
27	### ${##2}
28	set -- $(seq 25)
29	echo ${##2}
30	# stdout: 5
31	# N-I osh stdout-json: ""
32	# N-I osh status: 2
33
34	### ${###2}
35	set -- $(seq 25)
36	echo ${###2}
37	# stdout: 5
38	# BUG mksh stdout: 25
39	# N-I osh stdout-json: ""
40	# N-I osh status: 2
41
42	### ${1####}
43	set -- '####'
44	echo ${1####}
45	# stdout: ##
46
47	### ${1#'###'}
48	set -- '####'
49	echo ${1#'###'}
50	# stdout: #
51
52	### ${#1#'###'}
53	set -- '####'
54	echo ${#1#'###'}
55	# dash and zsh accept; mksh/bash/osh don't.
56	# status: 2
57	# stdout-json: ""
58	# OK dash/zsh status: 0
59	# OK dash stdout: 4
60	# OK zsh stdout: 1
61	# N-I bash/mksh status: 1