1	#!/usr/bin/env bash
2
3	#### Remove const suffix
4	v=abcd
5	echo ${v%d} ${v%%cd}
6	## stdout: abc ab
7
8	#### Remove const prefix
9	v=abcd
10	echo ${v#a} ${v##ab}
11	## stdout: bcd cd
12
13	#### Remove const suffix is vectorized on user array
14	a=(1a 2a 3a)
15	argv.py ${a[@]%a}
16	## stdout: ['1', '2', '3']
17	## status: 0
18	## N-I dash/mksh/ash stdout-json: ""
19	## N-I dash/ash status: 2
20	## N-I mksh status: 1
21
22	#### Remove const suffix is vectorized on $@ array
23	set -- 1a 2a 3a
24	argv.py ${@%a}
25	## stdout: ['1', '2', '3']
26	## status: 0
27	## N-I dash/ash stdout: ['1a', '2a', '3']
28	## N-I dash/ash status: 0
29	## N-I mksh stdout-json: ""
30	## N-I mksh status: 1
31
32	#### Remove const suffix from undefined
33	echo ${undef%suffix}
34	## stdout:
35
36	#### Remove shortest glob suffix
37	v=aabbccdd
38	echo ${v%c*}
39	## stdout: aabbc
40
41	#### Remove longest glob suffix
42	v=aabbccdd
43	echo ${v%%c*}
44	## stdout: aabb
45
46	#### Remove shortest glob prefix
47	v=aabbccdd
48	echo ${v#*b}
49	## stdout: bccdd
50
51	#### Remove longest glob prefix
52	v=aabbccdd
53	echo ${v##*b}
54	## stdout: ccdd
55
56	#### Strip char class
57	v=abc
58	echo ${v%[[:alpha:]]}
59	## stdout: ab
60	## N-I mksh stdout: abc
61
62	#### Strip unicode prefix
63	# NOTE: LANG is set to utf-8.
64	v='μ-'
65	echo ${v#?} # ? is a glob that stands for one character
66	## stdout: -
67	## BUG dash/mksh/ash stdout-repr: '\xbc-\n'
68	## BUG zsh stdout-repr: '\n'
69
70	#### Bug fix: Test that you can remove everything with glob
71	s='--x--'
72	argv.py "${s%%-*}" "${s%-*}" "${s#*-}" "${s##*-}"
73	## STDOUT:
74	['', '--x-', '-x--', '']
75	## END
76
77	#### Test that you can remove everything with const
78	s='abcd'
79	argv.py "${s%%abcd}" "${s%abcd}" "${s#abcd}" "${s##abcd}"
80	# failure case:
81	argv.py "${s%%abcde}" "${s%abcde}" "${s#abcde}" "${s##abcde}"
82	## STDOUT:
83	['', '', '', '']
84	['abcd', 'abcd', 'abcd', 'abcd']
85	## END
86
87	#### Prepend using replacement of #
88	# This case was found in Kubernetes and others
89	array=(aa bb '')
90	argv.py ${array[@]/#/prefix-}
91	## STDOUT:
92	['prefix-aa', 'prefix-bb', 'prefix-']
93	## END
94	## N-I dash/ash status: 2
95	## N-I dash/ash stdout-json: ""
96	## N-I mksh status: 1
97	## N-I mksh stdout-json: ""
98
99	#### Append using replacement of %
100	array=(aa bb '')
101	argv.py ${array[@]/%/-suffix}
102	## STDOUT:
103	['aa-suffix', 'bb-suffix', '-suffix']
104	## END
105	## N-I dash/ash status: 2
106	## N-I dash/ash stdout-json: ""
107	## N-I mksh status: 1
108	## N-I mksh stdout-json: ""
109
110	#### strip unquoted and quoted [
111	# I guess dash and mksh treat unquoted [ as an invalid glob?
112	var='[foo]'
113	echo ${var#[}
114	echo ${var#"["}
115	echo "${var#[}"
116	echo "${var#"["}"
117	## STDOUT:
118	foo]
119	foo]
120	foo]
121	foo]
122	## END
123	## OK dash/mksh STDOUT:
124	[foo]
125	foo]
126	[foo]
127	foo]
128	## END
129	## BUG zsh stdout-json: ""
130	## BUG zsh status: 1
131
132	#### strip unquoted and quoted []
133	# LooksLikeGlob('[]') is true
134	# I guess dash, mksh, and zsh treat unquoted [ as an invalid glob?
135	var='[]foo[]'
136	echo ${var#[]}
137	echo ${var#"[]"}
138	echo "${var#[]}"
139	echo "${var#"[]"}"
140	## STDOUT:
141	foo[]
142	foo[]
143	foo[]
144	foo[]
145	## END
146	## OK dash/mksh/zsh STDOUT:
147	[]foo[]
148	foo[]
149	[]foo[]
150	foo[]
151	## END
152
153	#### strip unquoted and quoted ?
154	var='[foo]'
155	echo ${var#?}
156	echo ${var#"?"}
157	echo "${var#?}"
158	echo "${var#"?"}"
159	## STDOUT:
160	foo]
161	[foo]
162	foo]
163	[foo]
164	## END
165
166	#### strip unquoted and quoted [a]
167	var='[a]foo[]'
168	echo ${var#[a]}
169	echo ${var#"[a]"}
170	echo "${var#[a]}"
171	echo "${var#"[a]"}"
172	## STDOUT:
173	[a]foo[]
174	foo[]
175	[a]foo[]
176	foo[]
177	## END