1	#!/usr/bin/env bash
2
3	#### implicit for loop
4	# This is like "for i in $@".
5	func() {
6	for i; do
7	echo $i
8	done
9	}
10	func 1 2 3
11	## STDOUT:
12	1
13	2
14	3
15	## END
16
17	#### empty for loop (has "in")
18	set -- 1 2 3
19	for i in ; do
20	echo $i
21	done
22	## stdout-json: ""
23
24	#### for loop with invalid identifier
25	# should be compile time error, but runtime error is OK too
26	for - in a b c; do
27	echo hi
28	done
29	## stdout-json: ""
30	## status: 2
31	## OK bash/mksh status: 1
32	## BUG zsh stdout: hi
33	## BUG zsh status: 1
34
35	#### Tilde expansion within for loop
36	HOME=/home/bob
37	for name in ~/src ~/git; do
38	echo $name
39	done
40	## STDOUT:
41	/home/bob/src
42	/home/bob/git
43	## END
44
45	#### Brace Expansion within Array
46	for i in -{a,b} {c,d}-; do
47	echo $i
48	done
49	## STDOUT:
50	-a
51	-b
52	c-
53	d-
54	## END
55	## N-I dash STDOUT:
56	-{a,b}
57	{c,d}-
58	## END
59
60	#### using loop var outside loop
61	func() {
62	for i in a b c; do
63	echo $i
64	done
65	echo $i
66	}
67	func
68	## status: 0
69	## STDOUT:
70	a
71	b
72	c
73	c
74	## END
75
76	#### continue
77	for i in a b c; do
78	echo $i
79	if test $i = b; then
80	continue
81	fi
82	echo $i
83	done
84	## status: 0
85	## STDOUT:
86	a
87	a
88	b
89	c
90	c
91	## END
92
93	#### break
94	for i in a b c; do
95	echo $i
96	if test $i = b; then
97	break
98	fi
99	done
100	## status: 0
101	## STDOUT:
102	a
103	b
104	## END
105
106	#### dynamic control flow (KNOWN INCOMPATIBILITY)
107	# hm would it be saner to make FATAL builtins called break/continue/etc.?
108	# On the other hand, this spits out errors loudly.
109	b=break
110	for i in 1 2 3; do
111	echo $i
112	$b
113	done
114	## STDOUT:
115	1
116	## END
117	## OK osh STDOUT:
118	1
119	2
120	3
121	## END
122	## OK osh status: 127
123
124	#### while in while condition
125	# This is a consequence of the grammar
126	while while true; do echo cond; break; done
127	do
128	echo body
129	break
130	done
131	## STDOUT:
132	cond
133	body
134	## END
135
136	#### while in pipe
137	x=$(find spec/ | wc -l)
138	y=$(find spec/ | while read path; do
139	echo $path
140	done | wc -l
141	)
142	test $x -eq $y
143	echo status=$?
144	## stdout: status=0
145
146	#### while in pipe with subshell
147	i=0
148	find . -maxdepth 1 -name INSTALL.txt -o -name LICENSE.txt | ( while read path; do
149	i=$((i+1))
150	#echo $i
151	done
152	echo $i )
153	## stdout: 2
154
155	#### until loop
156	# This is just the opposite of while? while ! cond?
157	until false; do
158	echo hi
159	break
160	done
161	## stdout: hi
162
163	#### continue at top level
164	# zsh behaves with strict-control-flow!
165	if true; then
166	echo one
167	continue
168	echo two
169	fi
170	## status: 0
171	## STDOUT:
172	one
173	two
174	## END
175	## OK zsh status: 1
176	## OK zsh STDOUT:
177	one
178	## END
179
180	#### continue in subshell
181	for i in $(seq 2); do
182	echo "> $i"
183	( if true; then continue; fi; echo "Should not print" )
184	echo subshell status=$?
185	echo ". $i"
186	done
187	## STDOUT:
188	# osh lets you fail
189	> 1
190	subshell status=1
191	. 1
192	> 2
193	subshell status=1
194	. 2
195	## END
196	## OK dash/bash/zsh STDOUT:
197	> 1
198	subshell status=0
199	. 1
200	> 2
201	subshell status=0
202	. 2
203	## END
204	## BUG mksh STDOUT:
205	> 1
206	Should not print
207	subshell status=0
208	. 1
209	> 2
210	Should not print
211	subshell status=0
212	. 2
213	## END
214
215	#### continue in subshell aborts with errexit
216	# The other shells don't let you recover from this programming error!
217	set -o errexit
218	for i in $(seq 2); do
219	echo "> $i"
220	( if true; then continue; fi; echo "Should not print" )
221	echo 'should fail after subshell'
222	echo ". $i"
223	done
224	## STDOUT:
225	> 1
226	## END
227	## status: 1
228	## BUG dash/bash/zsh STDOUT:
229	> 1
230	should fail after subshell
231	. 1
232	> 2
233	should fail after subshell
234	. 2
235	## END
236	## BUG dash/bash/zsh status: 0
237	## BUG mksh STDOUT:
238	> 1
239	Should not print
240	should fail after subshell
241	. 1
242	> 2
243	Should not print
244	should fail after subshell
245	. 2
246	## END
247	## BUG mksh status: 0
248
249	#### bad arg to break
250	x=oops
251	while true; do
252	echo hi
253	break $x
254	sleep 0.1
255	done
256	## stdout: hi
257	## status: 1
258	## OK dash status: 2
259	## OK bash status: 128
260
261	#### too many args to continue
262	# OSH treats this as a parse error
263	for x in a b c; do
264	echo $x
265	# bash breaks rather than continue or fatal error!!!
266	continue 1 2 3
267	done
268	echo --
269	## stdout-json: ""
270	## status: 2
271	## BUG bash STDOUT:
272	a
273	--
274	## END
275	## OK bash status: 0
276	## BUG dash/mksh/zsh STDOUT:
277	a
278	b
279	c
280	--
281	## END
282	## BUG dash/mksh/zsh status: 0