1 |
|
2 |
#### Lazy Evaluation of Alternative |
3 |
i=0 |
4 |
x=x |
5 |
echo ${x:-$((i++))} |
6 |
echo $i |
7 |
echo ${undefined:-$((i++))} |
8 |
echo $i # i is one because the alternative was only evaluated once |
9 |
## status: 0 |
10 |
## stdout-json: "x\n0\n0\n1\n" |
11 |
## N-I dash status: 2 |
12 |
## N-I dash stdout-json: "x\n0\n" |
13 |
|
14 |
#### Default value when empty |
15 |
empty='' |
16 |
echo ${empty:-is empty} |
17 |
## stdout: is empty |
18 |
|
19 |
#### Default value when unset |
20 |
echo ${unset-is unset} |
21 |
## stdout: is unset |
22 |
|
23 |
#### Unquoted with array as default value |
24 |
set -- '1 2' '3 4' |
25 |
argv.py X${unset=x"$@"x}X |
26 |
argv.py X${unset=x$@x}X # If you want OSH to split, write this |
27 |
# osh |
28 |
## STDOUT: |
29 |
['Xx1', '2', '3', '4xX'] |
30 |
['Xx1', '2', '3', '4xX'] |
31 |
## END |
32 |
## OK osh STDOUT: |
33 |
['Xx1 2', '3 4xX'] |
34 |
['Xx1', '2', '3', '4xX'] |
35 |
## END |
36 |
|
37 |
#### Quoted with array as default value |
38 |
set -- '1 2' '3 4' |
39 |
argv.py "X${unset=x"$@"x}X" |
40 |
argv.py "X${unset=x$@x}X" # OSH is the same here |
41 |
## STDOUT: |
42 |
['Xx1 2 3 4xX'] |
43 |
['Xx1 2 3 4xX'] |
44 |
## END |
45 |
## BUG bash STDOUT: |
46 |
['Xx1', '2', '3', '4xX'] |
47 |
['Xx1 2 3 4xX'] |
48 |
## END |
49 |
## OK osh STDOUT: |
50 |
['Xx1 2', '3 4xX'] |
51 |
['Xx1 2 3 4xX'] |
52 |
## END |
53 |
|
54 |
#### Assign default with array |
55 |
set -- '1 2' '3 4' |
56 |
argv.py X${unset=x"$@"x}X |
57 |
argv.py "$unset" |
58 |
## STDOUT: |
59 |
['Xx1', '2', '3', '4xX'] |
60 |
['x1 2 3 4x'] |
61 |
## END |
62 |
## OK osh STDOUT: |
63 |
['Xx1 2', '3 4xX'] |
64 |
['x1 2 3 4x'] |
65 |
## END |
66 |
|
67 |
#### Assign default value when empty |
68 |
empty='' |
69 |
${empty:=is empty} |
70 |
echo $empty |
71 |
## stdout: is empty |
72 |
|
73 |
#### Assign default value when unset |
74 |
${unset=is unset} |
75 |
echo $unset |
76 |
## stdout: is unset |
77 |
|
78 |
#### ${v:+foo} Alternative value when empty |
79 |
v=foo |
80 |
empty='' |
81 |
echo ${v:+v is not empty} ${empty:+is not empty} |
82 |
## stdout: v is not empty |
83 |
|
84 |
#### ${v+foo} Alternative value when unset |
85 |
v=foo |
86 |
echo ${v+v is not unset} ${unset:+is not unset} |
87 |
## stdout: v is not unset |
88 |
|
89 |
#### "${x+foo}" quoted (regression) |
90 |
# Python's configure caught this |
91 |
argv.py "${with_icc+set}" = set |
92 |
## STDOUT: |
93 |
['', '=', 'set'] |
94 |
## END |
95 |
|
96 |
#### ${v+foo} and ${v:+foo} when set -u |
97 |
set -u |
98 |
v=v |
99 |
echo v=${v:+foo} |
100 |
echo v=${v+foo} |
101 |
unset v |
102 |
echo v=${v:+foo} |
103 |
echo v=${v+foo} |
104 |
## STDOUT: |
105 |
v=foo |
106 |
v=foo |
107 |
v= |
108 |
v= |
109 |
## END |
110 |
|
111 |
#### ${v-foo} and ${v:-foo} when set -u |
112 |
set -u |
113 |
v=v |
114 |
echo v=${v:-foo} |
115 |
echo v=${v-foo} |
116 |
unset v |
117 |
echo v=${v:-foo} |
118 |
echo v=${v-foo} |
119 |
## STDOUT: |
120 |
v=v |
121 |
v=v |
122 |
v=foo |
123 |
v=foo |
124 |
## END |
125 |
|
126 |
#### array and - and + |
127 |
case $SH in (dash) exit ;; esac |
128 |
|
129 |
shopt -s compat_array # to refer to array as scalar |
130 |
|
131 |
empty=() |
132 |
a1=('') |
133 |
a2=('' x) |
134 |
a3=(3 4) |
135 |
echo empty=${empty[@]-minus} |
136 |
echo a1=${a1[@]-minus} |
137 |
echo a1[0]=${a1[0]-minus} |
138 |
echo a2=${a2[@]-minus} |
139 |
echo a3=${a3[@]-minus} |
140 |
echo --- |
141 |
|
142 |
echo empty=${empty[@]+plus} |
143 |
echo a1=${a1[@]+plus} |
144 |
echo a1[0]=${a1[0]+plus} |
145 |
echo a2=${a2[@]+plus} |
146 |
echo a3=${a3[@]+plus} |
147 |
echo --- |
148 |
|
149 |
echo empty=${empty+plus} |
150 |
echo a1=${a1+plus} |
151 |
echo a2=${a2+plus} |
152 |
echo a3=${a3+plus} |
153 |
echo --- |
154 |
|
155 |
# Test quoted arrays too |
156 |
argv.py "${empty[@]-minus}" |
157 |
argv.py "${empty[@]+plus}" |
158 |
argv.py "${a1[@]-minus}" |
159 |
argv.py "${a1[@]+plus}" |
160 |
argv.py "${a1[0]-minus}" |
161 |
argv.py "${a1[0]+plus}" |
162 |
argv.py "${a2[@]-minus}" |
163 |
argv.py "${a2[@]+plus}" |
164 |
argv.py "${a3[@]-minus}" |
165 |
argv.py "${a3[@]+plus}" |
166 |
|
167 |
## STDOUT: |
168 |
empty=minus |
169 |
a1= |
170 |
a1[0]= |
171 |
a2= x |
172 |
a3=3 4 |
173 |
--- |
174 |
empty= |
175 |
a1=plus |
176 |
a1[0]=plus |
177 |
a2=plus |
178 |
a3=plus |
179 |
--- |
180 |
empty= |
181 |
a1=plus |
182 |
a2=plus |
183 |
a3=plus |
184 |
--- |
185 |
['minus'] |
186 |
[] |
187 |
[''] |
188 |
['plus'] |
189 |
[''] |
190 |
['plus'] |
191 |
['', 'x'] |
192 |
['plus'] |
193 |
['3', '4'] |
194 |
['plus'] |
195 |
## END |
196 |
## N-I dash stdout-json: "" |
197 |
|
198 |
#### $@ and - and + |
199 |
echo argv=${@-minus} |
200 |
echo argv=${@+plus} |
201 |
echo argv=${@:-minus} |
202 |
echo argv=${@:+plus} |
203 |
## STDOUT: |
204 |
argv=minus |
205 |
argv= |
206 |
argv=minus |
207 |
argv= |
208 |
## END |
209 |
## BUG dash STDOUT: |
210 |
argv= |
211 |
argv=plus |
212 |
argv=minus |
213 |
argv= |
214 |
## END |
215 |
|
216 |
#### assoc array and - and + |
217 |
case $SH in (dash|mksh) exit ;; esac |
218 |
|
219 |
declare -A empty=() |
220 |
declare -A assoc=(['k']=v) |
221 |
|
222 |
echo empty=${empty[@]-minus} |
223 |
echo empty=${empty[@]+plus} |
224 |
echo assoc=${assoc[@]-minus} |
225 |
echo assoc=${assoc[@]+plus} |
226 |
|
227 |
echo --- |
228 |
echo empty=${empty[@]:-minus} |
229 |
echo empty=${empty[@]:+plus} |
230 |
echo assoc=${assoc[@]:-minus} |
231 |
echo assoc=${assoc[@]:+plus} |
232 |
## STDOUT: |
233 |
empty=minus |
234 |
empty= |
235 |
assoc=v |
236 |
assoc=plus |
237 |
--- |
238 |
empty=minus |
239 |
empty= |
240 |
assoc=v |
241 |
assoc=plus |
242 |
## END |
243 |
## N-I dash/mksh stdout-json: "" |
244 |
|
245 |
|
246 |
#### Error when empty |
247 |
empty='' |
248 |
echo ${empty:?'is em'pty} # test eval of error |
249 |
echo should not get here |
250 |
## stdout-json: "" |
251 |
## status: 1 |
252 |
## OK dash status: 2 |
253 |
|
254 |
#### Error when unset |
255 |
echo ${unset?is empty} |
256 |
echo should not get here |
257 |
## stdout-json: "" |
258 |
## status: 1 |
259 |
## OK dash status: 2 |
260 |
|
261 |
#### Error when unset |
262 |
v=foo |
263 |
echo ${v+v is not unset} ${unset:+is not unset} |
264 |
## stdout: v is not unset |
265 |
|
266 |
#### ${var=x} dynamic scope |
267 |
f() { : "${hello:=x}"; echo $hello; } |
268 |
f |
269 |
echo hello=$hello |
270 |
|
271 |
f() { hello=x; } |
272 |
f |
273 |
echo hello=$hello |
274 |
## STDOUT: |
275 |
x |
276 |
hello=x |
277 |
hello=x |
278 |
## END |
279 |
|
280 |
#### array ${arr[0]=x} |
281 |
arr=() |
282 |
echo ${#arr[@]} |
283 |
: ${arr[0]=x} |
284 |
echo ${#arr[@]} |
285 |
## STDOUT: |
286 |
0 |
287 |
1 |
288 |
## END |
289 |
## N-I dash status: 2 |
290 |
## N-I dash stdout-json: "" |
291 |
|
292 |
#### assoc array ${arr["k"]=x} |
293 |
# note: this also works in zsh |
294 |
|
295 |
declare -A arr=() |
296 |
echo ${#arr[@]} |
297 |
: ${arr['k']=x} |
298 |
echo ${#arr[@]} |
299 |
## STDOUT: |
300 |
0 |
301 |
1 |
302 |
## END |
303 |
## N-I dash status: 2 |
304 |
## N-I dash stdout-json: "" |
305 |
## N-I mksh status: 1 |
306 |
## N-I mksh stdout-json: "" |
307 |
|
308 |
#### "\z" as arg |
309 |
echo "${undef-\$}" |
310 |
echo "${undef-\(}" |
311 |
echo "${undef-\z}" |
312 |
echo "${undef-\"}" |
313 |
echo "${undef-\`}" |
314 |
echo "${undef-\\}" |
315 |
## STDOUT: |
316 |
$ |
317 |
\( |
318 |
\z |
319 |
" |
320 |
` |
321 |
\ |
322 |
## END |
323 |
## BUG yash STDOUT: |
324 |
$ |
325 |
( |
326 |
z |
327 |
" |
328 |
` |
329 |
\ |
330 |
## END |
331 |
|
332 |
#### "\e" as arg |
333 |
echo "${undef-\e}" |
334 |
## STDOUT: |
335 |
\e |
336 |
## END |
337 |
## BUG zsh/mksh stdout-repr: '\x1b\n' |
338 |
## BUG yash stdout: e |
339 |
|