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 flag
52	set -- -h -x
53	while getopts "hc:" opt; do
54	case $opt in
55	h) FLAG_h=1 ;;
56	c) FLAG_c="$OPTARG" ;;
57	'?') echo ERROR $OPTIND; exit 2; ;;
58	esac
59	done
60	echo status=$?
61	# stdout: ERROR 3
62	# status: 2
63
64	### getopts missing required argument
65	set -- -h -c
66	while getopts "hc:" opt; do
67	case $opt in
68	h) FLAG_h=1 ;;
69	c) FLAG_c="$OPTARG" ;;
70	'?') echo ERROR $OPTIND; exit 2; ;;
71	esac
72	done
73	echo status=$?
74	# stdout: ERROR 3
75	# status: 2
76
77	### getopts doesn't look for flags after args
78	set -- x -h -c y
79	FLAG_h=0
80	FLAG_c=''
81	while getopts "hc:" opt; do
82	case $opt in
83	h) FLAG_h=1 ;;
84	c) FLAG_c="$OPTARG" ;;
85	esac
86	done
87	shift $(( OPTIND - 1 ))
88	echo h=$FLAG_h c=$FLAG_c optind=$OPTIND argv=$@
89	# stdout: h=0 c= optind=1 argv=x -h -c y
90
91	### getopts with explicit args
92	# NOTE: Alpine doesn't appear to use this
93	FLAG_h=0
94	FLAG_c=''
95	arg=''
96	while getopts "hc:" opt -h -c foo x y z; do
97	case $opt in
98	h) FLAG_h=1 ;;
99	c) FLAG_c="$OPTARG" ;;
100	esac
101	done
102	echo h=$FLAG_h c=$FLAG_c optind=$OPTIND argv=$@
103	# stdout: h=1 c=foo optind=4 argv=
104
105	### OPTIND
106	echo $OPTIND
107	# stdout: 1
108
109	### OPTIND after multiple getopts with same spec
110	while getopts "hc:" opt; do
111	echo '-'
112	done
113	echo $OPTIND
114
115	set -- -h -c foo x y z
116	while getopts "hc:" opt; do
117	echo '-'
118	done
119	echo $OPTIND
120
121	set --
122	while getopts "hc:" opt; do
123	echo '-'
124	done
125	echo $OPTIND
126	# stdout-json: "1\n-\n-\n4\n1\n"
127	# BUG mksh/osh stdout-json: "1\n-\n-\n4\n4\n"
128
129	### OPTIND after multiple getopts with different spec
130	# Wow this is poorly specified! A fundamental design problem with the global
131	# variable OPTIND.
132	set -- -a
133	while getopts "ab:" opt; do
134	echo '.'
135	done
136	echo $OPTIND
137
138	set -- -c -d -e foo
139	while getopts "cde:" opt; do
140	echo '-'
141	done
142	echo $OPTIND
143
144	set -- -f
145	while getopts "f:" opt; do
146	echo '_'
147	done
148	echo $OPTIND
149	# stdout-json: ".\n2\n-\n-\n5\n2\n"
150	# BUG ash/dash stdout-json: ".\n2\n-\n-\n-\n5\n_\n2\n"
151	# BUG mksh/osh stdout-json: ".\n2\n-\n-\n5\n5\n"
152
153	### OPTIND narrowed down
154	FLAG_a=
155	FLAG_b=
156	FLAG_c=
157	FLAG_d=
158	FLAG_e=
159	set -- -a
160	while getopts "ab:" opt; do
161	case $opt in
162	a) FLAG_a=1 ;;
163	b) FLAG_b="$OPTARG" ;;
164	esac
165	done
166	# Bash doesn't reset optind! It skips over c! mksh at least warns about this!
167	# You have to reset OPTIND yourself.
168
169	set -- -c -d -e E
170	while getopts "cde:" opt; do
171	case $opt in
172	c) FLAG_c=1 ;;
173	d) FLAG_d=1 ;;
174	e) FLAG_e="$OPTARG" ;;
175	esac
176	done
177
178	echo a=$FLAG_a b=$FLAG_b c=$FLAG_c d=$FLAG_d e=$FLAG_e
179	# stdout: a=1 b= c=1 d=1 e=E
180	# BUG bash/mksh/osh stdout: a=1 b= c= d=1 e=E
181
182
183	### Getopts parses the function's arguments
184	# NOTE: GLOBALS are set, not locals! Bad interface.
185	FLAG_h=0
186	FLAG_c=''
187	myfunc() {
188	while getopts "hc:" opt; do
189	case $opt in
190	h) FLAG_h=1 ;;
191	c) FLAG_c="$OPTARG" ;;
192	esac
193	done
194	}
195	set -- -h -c foo x y z
196	myfunc -c bar
197	echo h=$FLAG_h c=$FLAG_c opt=$opt optind=$OPTIND argv=$@
198	# stdout: h=0 c=bar opt=? optind=3 argv=-h -c foo x y z
199