1	#!/usr/bin/env bash
2	#
3	# Test combination of var ops.
4
5	### String length
6	v=foo
7	echo ${#v}
8	# stdout: 3
9
10	### Length of undefined variable
11	echo ${#undef}
12	# stdout: 0
13
14	### Length of undefined variable with nounset
15	set -o nounset
16	echo ${#undef}
17	# status: 1
18	# OK dash status: 2
19
20	### Cannot take length of substring slice
21	# These are runtime errors, but we could make them parse time errors.
22	v=abcde
23	echo ${#v:1:3}
24	# status: 1
25	# N-I dash status: 0
26	# N-I dash stdout: 5
27
28	### Pattern replacement
29	v=abcde
30	echo ${v/c*/XX}
31	# stdout: abXX
32	# N-I dash status: 2
33	# N-I dash stdout-json: ""
34
35	### Pattern replacement ${v/} is not valid
36	v=abcde
37	echo -${v/}-
38	echo status=$?
39	# status: 2
40	# stdout-json: ""
41	# N-I dash status: 2
42	# N-I dash stdout-json: ""
43	# BUG bash/mksh status: 0
44	# BUG bash/mksh stdout-json: "-abcde-\nstatus=0\n"
45
46	### Pattern replacement ${v//} is not valid
47	v='a/b/c'
48	echo -${v//}-
49	echo status=$?
50	# status: 2
51	# stdout-json: ""
52	# N-I dash status: 2
53	# N-I dash stdout-json: ""
54	# BUG bash/mksh status: 0
55	# BUG bash/mksh stdout-json: "-a/b/c-\nstatus=0\n"
56
57	### String slice
58	foo=abcdefg
59	echo ${foo:1:3}
60	# stdout: bcd
61	# N-I dash status: 2
62	# N-I dash stdout-json: ""
63
64	### Negative string slice
65	foo=abcdefg
66	echo ${foo: -4:3}
67	# stdout: def
68	# N-I dash status: 2
69	# N-I dash stdout-json: ""
70
71	### String slice with math
72	# I think this is the $(()) language inside?
73	i=1
74	foo=abcdefg
75	echo ${foo: i-3-2 : i + 2}
76	# stdout: def
77	# N-I dash status: 2
78	# N-I dash stdout-json: ""