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