1	#!/bin/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
18	### ${####}
19	set -- $(seq 25)
20	echo ${####}
21	# stdout: 25
22
23	### ${##2}
24	set -- $(seq 25)
25	echo ${##2}
26	# stdout: 5
27
28	### ${###2}
29	set -- $(seq 25)
30	echo ${###2}
31	# stdout: 5
32	# BUG mksh stdout: 25
33
34	### ${1####}
35	set -- '####'
36	echo ${1####}
37	# stdout: ##
38
39	### ${1#'###'}
40	set -- '####'
41	echo ${1#'###'}
42	# stdout: #
43
44	### ${#1#'###'}
45	set -- '####'
46	echo ${#1#'###'}
47	# dash and zsh accept; mksh and bash don't
48	# OK dash stdout: 4
49	# OK zsh stdout: 1
50	# N-I bash/mksh stdout-json: ""