1	#!/bin/bash
2	#
3	# Bash implements type -t.
4	#
5	# NOTE: Aliases don't work in batch mode! Interactive only.
6
7	#### getopts empty
8	set --
9	getopts 'a:' opt
10	echo "status=$? opt=$opt OPTARG=$OPTARG"
11	## stdout: status=1 opt=? OPTARG=
12
13	#### getopts sees unknown arg
14	set -- -Z
15	getopts 'a:' opt
16	echo "status=$? opt=$opt OPTARG=$OPTARG"
17	## stdout: status=0 opt=? OPTARG=
18
19	#### getopts three invocations
20	set -- -h -c foo
21	getopts 'hc:' opt
22	echo status=$? opt=$opt
23	getopts 'hc:' opt
24	echo status=$? opt=$opt
25	getopts 'hc:' opt
26	echo status=$? opt=$opt
27	## stdout-json: "status=0 opt=h\nstatus=0 opt=c\nstatus=1 opt=?\n"
28
29	#### getopts resets OPTARG
30	set -- -c foo -h
31	getopts 'hc:' opt
32	echo status=$? opt=$opt OPTARG=$OPTARG
33	getopts 'hc:' opt
34	echo status=$? opt=$opt OPTARG=$OPTARG
35	## stdout-json: "status=0 opt=c OPTARG=foo\nstatus=0 opt=h OPTARG=\n"
36
37	#### Basic getopts invocation
38	set -- -h -c foo x y z
39	FLAG_h=0
40	FLAG_c=''
41	while getopts "hc:" opt; do
42	case $opt in
43	h) FLAG_h=1 ;;
44	c) FLAG_c="$OPTARG" ;;
45	esac
46	done
47	shift $(( OPTIND - 1 ))
48	echo h=$FLAG_h c=$FLAG_c optind=$OPTIND argv=$@
49	## stdout: h=1 c=foo optind=4 argv=x y z
50
51	#### getopts with invalid variable name
52	set -- -c foo -h
53	getopts 'hc:' opt-
54	echo status=$? opt=$opt OPTARG=$OPTARG OPTIND=$OPTIND
55	## stdout: status=2 opt= OPTARG=foo OPTIND=3
56	## OK bash stdout: status=1 opt= OPTARG=foo OPTIND=3
57	## OK mksh stdout: status=1 opt= OPTARG= OPTIND=1
58
59	#### getopts with invalid flag
60	set -- -h -x
61	while getopts "hc:" opt; do
62	case $opt in
63	h) FLAG_h=1 ;;
64	c) FLAG_c="$OPTARG" ;;
65	'?') echo ERROR $OPTIND; exit 2; ;;
66	esac
67	done
68	echo status=$?
69	## stdout: ERROR 3
70	## status: 2
71
72	#### getopts missing required argument
73	set -- -h -c
74	while getopts "hc:" opt; do
75	case $opt in
76	h) FLAG_h=1 ;;
77	c) FLAG_c="$OPTARG" ;;
78	'?') echo ERROR $OPTIND; exit 2; ;;
79	esac
80	done
81	echo status=$?
82	## stdout: ERROR 3
83	## status: 2
84
85	#### getopts doesn't look for flags after args
86	set -- x -h -c y
87	FLAG_h=0
88	FLAG_c=''
89	while getopts "hc:" opt; do
90	case $opt in
91	h) FLAG_h=1 ;;
92	c) FLAG_c="$OPTARG" ;;
93	esac
94	done
95	shift $(( OPTIND - 1 ))
96	echo h=$FLAG_h c=$FLAG_c optind=$OPTIND argv=$@
97	## stdout: h=0 c= optind=1 argv=x -h -c y
98
99	#### getopts with explicit args
100	# NOTE: Alpine doesn't appear to use this, but bash-completion does.
101	FLAG_h=0
102	FLAG_c=''
103	arg=''
104	set -- A B C
105	while getopts "hc:" opt -h -c foo x y z; do
106	case $opt in
107	h) FLAG_h=1 ;;
108	c) FLAG_c="$OPTARG" ;;
109	esac
110	done
111	echo h=$FLAG_h c=$FLAG_c optind=$OPTIND argv=$@
112	## STDOUT:
113	h=1 c=foo optind=4 argv=A B C
114	## END
115
116	#### OPTIND
117	echo $OPTIND
118	## stdout: 1
119
120	#### OPTIND after multiple getopts with same spec
121	while getopts "hc:" opt; do
122	echo '-'
123	done
124	echo $OPTIND
125
126	set -- -h -c foo x y z
127	while getopts "hc:" opt; do
128	echo '-'
129	done
130	echo $OPTIND
131
132	set --
133	while getopts "hc:" opt; do
134	echo '-'
135	done
136	echo $OPTIND
137	## stdout-json: "1\n-\n-\n4\n1\n"
138	## BUG mksh/osh stdout-json: "1\n-\n-\n4\n4\n"
139
140	#### OPTIND after multiple getopts with different spec
141	# Wow this is poorly specified! A fundamental design problem with the global
142	# variable OPTIND.
143	set -- -a
144	while getopts "ab:" opt; do
145	echo '.'
146	done
147	echo $OPTIND
148
149	set -- -c -d -e foo
150	while getopts "cde:" opt; do
151	echo '-'
152	done
153	echo $OPTIND
154
155	set -- -f
156	while getopts "f:" opt; do
157	echo '_'
158	done
159	echo $OPTIND
160	## stdout-json: ".\n2\n-\n-\n5\n2\n"
161	## BUG ash/dash stdout-json: ".\n2\n-\n-\n-\n5\n_\n2\n"
162	## BUG mksh/osh stdout-json: ".\n2\n-\n-\n5\n5\n"
163
164	#### OPTIND narrowed down
165	FLAG_a=
166	FLAG_b=
167	FLAG_c=
168	FLAG_d=
169	FLAG_e=
170	set -- -a
171	while getopts "ab:" opt; do
172	case $opt in
173	a) FLAG_a=1 ;;
174	b) FLAG_b="$OPTARG" ;;
175	esac
176	done
177	# Bash doesn't reset optind! It skips over c! mksh at least warns about this!
178	# You have to reset OPTIND yourself.
179
180	set -- -c -d -e E
181	while getopts "cde:" opt; do
182	case $opt in
183	c) FLAG_c=1 ;;
184	d) FLAG_d=1 ;;
185	e) FLAG_e="$OPTARG" ;;
186	esac
187	done
188
189	echo a=$FLAG_a b=$FLAG_b c=$FLAG_c d=$FLAG_d e=$FLAG_e
190	## stdout: a=1 b= c=1 d=1 e=E
191	## BUG bash/mksh/osh stdout: a=1 b= c= d=1 e=E
192
193
194	#### Getopts parses the function's arguments
195	FLAG_h=0
196	FLAG_c=''
197	myfunc() {
198	while getopts "hc:" opt; do
199	case $opt in
200	h) FLAG_h=1 ;;
201	c) FLAG_c="$OPTARG" ;;
202	esac
203	done
204	}
205	set -- -h -c foo x y z
206	myfunc -c bar
207	echo h=$FLAG_h c=$FLAG_c opt=$opt optind=$OPTIND argv=$@
208	## stdout: h=0 c=bar opt=? optind=3 argv=-h -c foo x y z
209
210	#### Local OPTIND
211	# minimal test case extracted from bash-completion
212	min() {
213	local OPTIND=1
214
215	while getopts "n:e:o:i:s" flag "$@"; do
216	echo "loop $OPTIND";
217	done
218	}
219	min -s
220	## stdout: loop 2
221
222	#### Flags can be smooshed together, e.g. -ab
223	getopts "ab:c:" opt -ab hi -c hello
224	echo OPTIND=$OPTIND opt=$opt OPTARG=$OPTARG
225	getopts "ab:c:" opt -ab hi -c hello
226	echo OPTIND=$OPTIND opt=$opt OPTARG=$OPTARG
227	getopts "ab:c:" opt -ab hi -c hello
228	echo OPTIND=$OPTIND opt=$opt OPTARG=$OPTARG
229	## STDOUT:
230	OPTIND=2 opt=a OPTARG=
231	OPTIND=3 opt=b OPTARG=hi
232	OPTIND=5 opt=c OPTARG=hello
233	## END
234	## BUG bash STDOUT:
235	OPTIND=1 opt=a OPTARG=
236	OPTIND=3 opt=b OPTARG=hi
237	OPTIND=5 opt=c OPTARG=hello
238	## END