1 |
|
2 |
#### implicit for loop |
3 |
# This is like "for i in $@". |
4 |
fun() { |
5 |
for i; do |
6 |
echo $i |
7 |
done |
8 |
} |
9 |
fun 1 2 3 |
10 |
## STDOUT: |
11 |
1 |
12 |
2 |
13 |
3 |
14 |
## END |
15 |
|
16 |
#### empty for loop (has "in") |
17 |
set -- 1 2 3 |
18 |
for i in ; do |
19 |
echo $i |
20 |
done |
21 |
## stdout-json: "" |
22 |
|
23 |
#### for loop with invalid identifier |
24 |
# should be compile time error, but runtime error is OK too |
25 |
for - in a b c; do |
26 |
echo hi |
27 |
done |
28 |
## stdout-json: "" |
29 |
## status: 2 |
30 |
## OK bash/mksh status: 1 |
31 |
## BUG zsh stdout: hi |
32 |
## BUG zsh status: 1 |
33 |
|
34 |
#### the word 'in' can be the loop variable |
35 |
|
36 |
for in in a b c; do |
37 |
echo $in |
38 |
done |
39 |
## STDOUT: |
40 |
a |
41 |
b |
42 |
c |
43 |
## END |
44 |
|
45 |
#### Tilde expansion within for loop |
46 |
HOME=/home/bob |
47 |
for name in ~/src ~/git; do |
48 |
echo $name |
49 |
done |
50 |
## STDOUT: |
51 |
/home/bob/src |
52 |
/home/bob/git |
53 |
## END |
54 |
|
55 |
#### Brace Expansion within Array |
56 |
for i in -{a,b} {c,d}-; do |
57 |
echo $i |
58 |
done |
59 |
## STDOUT: |
60 |
-a |
61 |
-b |
62 |
c- |
63 |
d- |
64 |
## END |
65 |
## N-I dash STDOUT: |
66 |
-{a,b} |
67 |
{c,d}- |
68 |
## END |
69 |
|
70 |
#### using loop var outside loop |
71 |
fun() { |
72 |
for i in a b c; do |
73 |
echo $i |
74 |
done |
75 |
echo $i |
76 |
} |
77 |
fun |
78 |
## status: 0 |
79 |
## STDOUT: |
80 |
a |
81 |
b |
82 |
c |
83 |
c |
84 |
## END |
85 |
|
86 |
#### continue |
87 |
for i in a b c; do |
88 |
echo $i |
89 |
if test $i = b; then |
90 |
continue |
91 |
fi |
92 |
echo $i |
93 |
done |
94 |
## status: 0 |
95 |
## STDOUT: |
96 |
a |
97 |
a |
98 |
b |
99 |
c |
100 |
c |
101 |
## END |
102 |
|
103 |
#### break |
104 |
for i in a b c; do |
105 |
echo $i |
106 |
if test $i = b; then |
107 |
break |
108 |
fi |
109 |
done |
110 |
## status: 0 |
111 |
## STDOUT: |
112 |
a |
113 |
b |
114 |
## END |
115 |
|
116 |
#### dynamic control flow (KNOWN INCOMPATIBILITY) |
117 |
# hm would it be saner to make FATAL builtins called break/continue/etc.? |
118 |
# On the other hand, this spits out errors loudly. |
119 |
b=break |
120 |
for i in 1 2 3; do |
121 |
echo $i |
122 |
$b |
123 |
done |
124 |
## STDOUT: |
125 |
1 |
126 |
## END |
127 |
## OK osh STDOUT: |
128 |
1 |
129 |
2 |
130 |
3 |
131 |
## END |
132 |
## OK osh status: 127 |
133 |
|
134 |
#### while in while condition |
135 |
# This is a consequence of the grammar |
136 |
while while true; do echo cond; break; done |
137 |
do |
138 |
echo body |
139 |
break |
140 |
done |
141 |
## STDOUT: |
142 |
cond |
143 |
body |
144 |
## END |
145 |
|
146 |
#### while in pipe |
147 |
x=$(find spec/ | wc -l) |
148 |
y=$(find spec/ | while read path; do |
149 |
echo $path |
150 |
done | wc -l |
151 |
) |
152 |
test $x -eq $y |
153 |
echo status=$? |
154 |
## stdout: status=0 |
155 |
|
156 |
#### while in pipe with subshell |
157 |
i=0 |
158 |
seq 3 | ( while read foo; do |
159 |
i=$((i+1)) |
160 |
#echo $i |
161 |
done |
162 |
echo $i ) |
163 |
## stdout: 3 |
164 |
|
165 |
#### until loop |
166 |
# This is just the opposite of while? while ! cond? |
167 |
until false; do |
168 |
echo hi |
169 |
break |
170 |
done |
171 |
## stdout: hi |
172 |
|
173 |
#### continue at top level |
174 |
if true; then |
175 |
echo one |
176 |
continue |
177 |
echo two |
178 |
fi |
179 |
## status: 0 |
180 |
## STDOUT: |
181 |
one |
182 |
two |
183 |
## END |
184 |
# zsh behaves like strict_control_flow! |
185 |
## OK zsh status: 1 |
186 |
## OK zsh STDOUT: |
187 |
one |
188 |
## END |
189 |
|
190 |
#### continue in subshell |
191 |
for i in $(seq 2); do |
192 |
echo "> $i" |
193 |
( if true; then continue; fi; echo "Should not print" ) |
194 |
echo subshell status=$? |
195 |
echo ". $i" |
196 |
done |
197 |
## STDOUT: |
198 |
# osh lets you fail |
199 |
> 1 |
200 |
subshell status=1 |
201 |
. 1 |
202 |
> 2 |
203 |
subshell status=1 |
204 |
. 2 |
205 |
## END |
206 |
## OK dash/bash/zsh STDOUT: |
207 |
> 1 |
208 |
subshell status=0 |
209 |
. 1 |
210 |
> 2 |
211 |
subshell status=0 |
212 |
. 2 |
213 |
## END |
214 |
## BUG mksh STDOUT: |
215 |
> 1 |
216 |
Should not print |
217 |
subshell status=0 |
218 |
. 1 |
219 |
> 2 |
220 |
Should not print |
221 |
subshell status=0 |
222 |
. 2 |
223 |
## END |
224 |
|
225 |
#### continue in subshell aborts with errexit |
226 |
# The other shells don't let you recover from this programming error! |
227 |
set -o errexit |
228 |
for i in $(seq 2); do |
229 |
echo "> $i" |
230 |
( if true; then continue; fi; echo "Should not print" ) |
231 |
echo 'should fail after subshell' |
232 |
echo ". $i" |
233 |
done |
234 |
## STDOUT: |
235 |
> 1 |
236 |
## END |
237 |
## status: 1 |
238 |
## BUG dash/bash/zsh STDOUT: |
239 |
> 1 |
240 |
should fail after subshell |
241 |
. 1 |
242 |
> 2 |
243 |
should fail after subshell |
244 |
. 2 |
245 |
## END |
246 |
## BUG dash/bash/zsh status: 0 |
247 |
## BUG mksh STDOUT: |
248 |
> 1 |
249 |
Should not print |
250 |
should fail after subshell |
251 |
. 1 |
252 |
> 2 |
253 |
Should not print |
254 |
should fail after subshell |
255 |
. 2 |
256 |
## END |
257 |
## BUG mksh status: 0 |
258 |
|
259 |
#### bad arg to break |
260 |
x=oops |
261 |
while true; do |
262 |
echo hi |
263 |
break $x |
264 |
sleep 0.1 |
265 |
done |
266 |
## stdout: hi |
267 |
## status: 1 |
268 |
## OK dash status: 2 |
269 |
## OK bash status: 128 |
270 |
|
271 |
#### too many args to continue |
272 |
# OSH treats this as a parse error |
273 |
for x in a b c; do |
274 |
echo $x |
275 |
# bash breaks rather than continue or fatal error!!! |
276 |
continue 1 2 3 |
277 |
done |
278 |
echo -- |
279 |
## stdout-json: "" |
280 |
## status: 2 |
281 |
## BUG bash STDOUT: |
282 |
a |
283 |
-- |
284 |
## END |
285 |
## OK bash status: 0 |
286 |
## BUG dash/mksh/zsh STDOUT: |
287 |
a |
288 |
b |
289 |
c |
290 |
-- |
291 |
## END |
292 |
## BUG dash/mksh/zsh status: 0 |
293 |
|
294 |
#### break in condition of loop |
295 |
while break; do |
296 |
echo x |
297 |
done |
298 |
echo done |
299 |
## STDOUT: |
300 |
done |
301 |
## END |
302 |
|
303 |
|
304 |
#### break in condition of nested loop |
305 |
for i in 1 2 3; do |
306 |
echo i=$i |
307 |
while break; do |
308 |
echo x |
309 |
done |
310 |
done |
311 |
echo done |
312 |
## STDOUT: |
313 |
i=1 |
314 |
i=2 |
315 |
i=3 |
316 |
done |
317 |
## END |
318 |
|
319 |
#### return within eval |
320 |
f() { |
321 |
echo one |
322 |
eval 'return' |
323 |
echo two |
324 |
} |
325 |
f |
326 |
## STDOUT: |
327 |
one |
328 |
## END |
329 |
|
330 |
#### break/continue within eval |
331 |
# NOTE: This changes things |
332 |
# set -e |
333 |
f() { |
334 |
for i in $(seq 5); do |
335 |
if test $i = 2; then |
336 |
eval continue |
337 |
fi |
338 |
if test $i = 4; then |
339 |
eval break |
340 |
fi |
341 |
echo $i |
342 |
done |
343 |
|
344 |
eval 'return' |
345 |
echo 'done' |
346 |
} |
347 |
f |
348 |
## STDOUT: |
349 |
1 |
350 |
3 |
351 |
## END |
352 |
## BUG mksh STDOUT: |
353 |
1 |
354 |
2 |
355 |
3 |
356 |
4 |
357 |
5 |
358 |
## END |
359 |
|
360 |
#### break/continue within source |
361 |
# NOTE: This changes things |
362 |
# set -e |
363 |
|
364 |
cd $REPO_ROOT |
365 |
f() { |
366 |
for i in $(seq 5); do |
367 |
if test $i = 2; then |
368 |
. spec/testdata/continue.sh |
369 |
fi |
370 |
if test $i = 4; then |
371 |
. spec/testdata/break.sh |
372 |
fi |
373 |
echo $i |
374 |
done |
375 |
|
376 |
# Return is different! |
377 |
. spec/testdata/return.sh |
378 |
echo done |
379 |
} |
380 |
f |
381 |
## STDOUT: |
382 |
1 |
383 |
3 |
384 |
done |
385 |
## END |
386 |
## BUG zsh/mksh STDOUT: |
387 |
1 |
388 |
2 |
389 |
3 |
390 |
4 |
391 |
5 |
392 |
done |
393 |
## END |
394 |
|
395 |
#### top-level break/continue/return (without strict_control_flow) |
396 |
$SH -c 'break; echo break=$?' |
397 |
$SH -c 'continue; echo continue=$?' |
398 |
$SH -c 'return; echo return=$?' |
399 |
## STDOUT: |
400 |
break=0 |
401 |
continue=0 |
402 |
## END |
403 |
## BUG zsh stdout-json: "" |
404 |
## BUG bash STDOUT: |
405 |
break=0 |
406 |
continue=0 |
407 |
return=1 |
408 |
## END |