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 skips function lookup
61	seq() {
62	echo "$@"
63	}
64	command # no-op
65	seq 3
66	command seq 3
67	# subshell shouldn't fork another process (but we don't have a good way of
68	# testing it)
69	( command seq 3 )
70	## STDOUT:
71	3
72	1
73	2
74	3
75	1
76	2
77	3
78	## END
79
80	#### command command seq 3
81	command command seq 3
82	## STDOUT:
83	1
84	2
85	3
86	## END
87	## N-I zsh stdout-json: ""
88	## N-I zsh status: 127
89
90	#### command command -v seq
91	seq() {
92	echo 3
93	}
94	command command -v seq
95	## stdout: seq
96	## N-I zsh stdout-json: ""
97	## N-I zsh status: 127
98
99	#### history usage
100	history
101	echo status=$?
102	history +5 # hm bash considers this valid
103	echo status=$?
104	history -5 # invalid flag
105	echo status=$?
106	history f
107	echo status=$?
108	history too many args
109	echo status=$?
110	## status: 0
111	## STDOUT:
112	status=0
113	status=0
114	status=2
115	status=2
116	status=2
117	## END
118	## OK bash STDOUT:
119	status=0
120	status=0
121	status=2
122	status=1
123	status=1
124	## END
125	## BUG zsh/mksh STDOUT:
126	status=1
127	status=1
128	status=1
129	status=1
130	status=1
131	## END
132	## N-I dash STDOUT:
133	status=127
134	status=127
135	status=127
136	status=127
137	status=127
138	## END
139
140	#### $(command type ls)
141	type() { echo FUNCTION; }
142	type
143	s=$(command type echo)
144	echo $s | grep builtin > /dev/null
145	echo status=$?
146	## STDOUT:
147	FUNCTION
148	status=0
149	## END
150	## N-I zsh STDOUT:
151	FUNCTION
152	status=1
153	## END
154	## N-I mksh STDOUT:
155	status=1
156	## END
157
158	#### builtin
159	cd () { echo "hi"; }
160	cd
161	builtin cd / && pwd
162	unset -f cd
163	## STDOUT:
164	hi
165	/
166	## END
167	## N-I dash STDOUT:
168	hi
169	## END
170
171	#### builtin ls not found
172	builtin ls
173	## status: 1
174	## N-I dash status: 127
175
176	#### builtin no args
177	builtin
178	## status: 0
179	## N-I dash status: 127
180
181	#### builtin command echo hi
182	builtin command echo hi
183	## status: 0
184	## stdout: hi
185	## N-I dash status: 127
186	## N-I dash stdout-json: ""