1	#!/bin/bash
2
3	#### command -v
4	myfunc() { echo x; }
5	command -v echo
6	echo $?
7	command -v myfunc
8	echo $?
9	command -v nonexistent # doesn't print anything
10	echo $?
11	command -v for
12	echo $?
13	## STDOUT:
14	echo
15	0
16	myfunc
17	0
18	1
19	for
20	0
21	## OK dash STDOUT:
22	echo
23	0
24	myfunc
25	0
26	127
27	for
28	0
29	## END
30
31	#### command -v with multiple names
32	# ALL FOUR SHELLS behave differently here!
33	#
34	# bash chooses to swallow the error! We agree with zsh if ANY word lookup
35	# fails, then the whole thing fails.
36
37	myfunc() { echo x; }
38	command -v echo myfunc ZZZ for
39	echo status=$?
40
41	## STDOUT:
42	echo
43	myfunc
44	for
45	status=1
46	## BUG bash STDOUT:
47	echo
48	myfunc
49	for
50	status=0
51	## BUG dash STDOUT:
52	echo
53	status=0
54	## OK mksh STDOUT:
55	echo
56	myfunc
57	status=1
58	## END
59
60	#### command -v doesn't find non-executable file
61	# PATH resolution is different
62
63	PATH="$TMP:$PATH"
64	touch $TMP/non-executable $TMP/executable
65	chmod +x $TMP/executable
66
67	command -v non-executable | grep -o /non-executable
68	echo status=$?
69
70	command -v executable | grep -o /executable
71	echo status=$?
72
73	## STDOUT:
74	status=1
75	/executable
76	status=0
77	## END
78
79	## BUG bash/dash STDOUT:
80	/non-executable
81	status=0
82	/executable
83	status=0
84	## END
85
86	#### command skips function lookup
87	seq() {
88	echo "$@"
89	}
90	command # no-op
91	seq 3
92	command seq 3
93	# subshell shouldn't fork another process (but we don't have a good way of
94	# testing it)
95	( command seq 3 )
96	## STDOUT:
97	3
98	1
99	2
100	3
101	1
102	2
103	3
104	## END
105
106	#### command command seq 3
107	command command seq 3
108	## STDOUT:
109	1
110	2
111	3
112	## END
113	## N-I zsh stdout-json: ""
114	## N-I zsh status: 127
115
116	#### command command -v seq
117	seq() {
118	echo 3
119	}
120	command command -v seq
121	## stdout: seq
122	## N-I zsh stdout-json: ""
123	## N-I zsh status: 127
124
125	#### history usage
126	history
127	echo status=$?
128	history +5 # hm bash considers this valid
129	echo status=$?
130	history -5 # invalid flag
131	echo status=$?
132	history f
133	echo status=$?
134	history too many args
135	echo status=$?
136	## status: 0
137	## STDOUT:
138	status=0
139	status=0
140	status=2
141	status=2
142	status=2
143	## END
144	## OK bash STDOUT:
145	status=0
146	status=0
147	status=2
148	status=1
149	status=1
150	## END
151	## BUG zsh/mksh STDOUT:
152	status=1
153	status=1
154	status=1
155	status=1
156	status=1
157	## END
158	## N-I dash STDOUT:
159	status=127
160	status=127
161	status=127
162	status=127
163	status=127
164	## END
165
166	#### $(command type ls)
167	type() { echo FUNCTION; }
168	type
169	s=$(command type echo)
170	echo $s | grep builtin > /dev/null
171	echo status=$?
172	## STDOUT:
173	FUNCTION
174	status=0
175	## END
176	## N-I zsh STDOUT:
177	FUNCTION
178	status=1
179	## END
180	## N-I mksh STDOUT:
181	status=1
182	## END
183
184	#### builtin
185	cd () { echo "hi"; }
186	cd
187	builtin cd / && pwd
188	unset -f cd
189	## STDOUT:
190	hi
191	/
192	## END
193	## N-I dash STDOUT:
194	hi
195	## END
196
197	#### builtin ls not found
198	builtin ls
199	## status: 1
200	## N-I dash status: 127
201
202	#### builtin no args
203	builtin
204	## status: 0
205	## N-I dash status: 127
206
207	#### builtin command echo hi
208	builtin command echo hi
209	## status: 0
210	## stdout: hi
211	## N-I dash status: 127
212	## N-I dash stdout-json: ""