| 1 | # |
| 2 | # NOTE: |
| 3 | # - $! is tested in background.test.sh |
| 4 | # - $- is tested in sh-options |
| 5 | # |
| 6 | # TODO: It would be nice to make a table, like: |
| 7 | # |
| 8 | # $$ $BASHPID $PPID $SHLVL $BASH_SUBSHELL |
| 9 | # X |
| 10 | # (Subshell, Command Sub, Pipeline, Spawn $0) |
| 11 | # |
| 12 | # And see whether the variable changed. |
| 13 | |
| 14 | #### $PWD is set |
| 15 | # Just test that it has a slash for now. |
| 16 | echo $PWD | grep / |
| 17 | ## status: 0 |
| 18 | |
| 19 | #### $PWD is not only set, but exported |
| 20 | env | grep PWD |
| 21 | ## status: 0 |
| 22 | ## BUG mksh status: 1 |
| 23 | |
| 24 | #### $PATH is set if unset at startup |
| 25 | |
| 26 | # Get absolute path before changing PATH |
| 27 | sh=$(which $SH) |
| 28 | |
| 29 | old_path=$PATH |
| 30 | unset PATH |
| 31 | |
| 32 | $sh -c 'echo $PATH' > path.txt |
| 33 | |
| 34 | PATH=$old_path |
| 35 | |
| 36 | # looks like PATH=/usr/bin:/bin for mksh, but more complicated for others |
| 37 | # cat path.txt |
| 38 | |
| 39 | # should contain /usr/bin |
| 40 | if egrep -q '(^|:)/usr/bin($|:)' path.txt; then |
| 41 | echo yes |
| 42 | fi |
| 43 | |
| 44 | # should contain /bin |
| 45 | if egrep -q '(^|:)/bin($|:)' path.txt ; then |
| 46 | echo yes |
| 47 | fi |
| 48 | |
| 49 | ## STDOUT: |
| 50 | yes |
| 51 | yes |
| 52 | ## END |
| 53 | |
| 54 | |
| 55 | #### $HOME is NOT set |
| 56 | case $SH in *zsh) echo 'zsh sets HOME'; exit ;; esac |
| 57 | |
| 58 | home=$(echo $HOME) |
| 59 | test "$home" = "" |
| 60 | echo status=$? |
| 61 | |
| 62 | env | grep HOME |
| 63 | echo status=$? |
| 64 | |
| 65 | # not in interactive shell either |
| 66 | $SH -i -c 'echo $HOME' | grep / |
| 67 | echo status=$? |
| 68 | |
| 69 | ## STDOUT: |
| 70 | status=0 |
| 71 | status=1 |
| 72 | status=1 |
| 73 | ## END |
| 74 | ## BUG zsh STDOUT: |
| 75 | zsh sets HOME |
| 76 | ## END |
| 77 | |
| 78 | |
| 79 | #### $1 .. $9 are scoped, while $0 is not |
| 80 | fun() { echo $0 $1 $2 | sed -e 's/.*sh/sh/'; } |
| 81 | fun a b |
| 82 | ## stdout: sh a b |
| 83 | ## BUG zsh stdout: fun a b |
| 84 | |
| 85 | #### $? |
| 86 | echo $? # starts out as 0 |
| 87 | sh -c 'exit 33' |
| 88 | echo $? |
| 89 | ## STDOUT: |
| 90 | 0 |
| 91 | 33 |
| 92 | ## END |
| 93 | ## status: 0 |
| 94 | |
| 95 | #### $# |
| 96 | set -- 1 2 3 4 |
| 97 | echo $# |
| 98 | ## stdout: 4 |
| 99 | ## status: 0 |
| 100 | |
| 101 | #### $_ |
| 102 | # This is bash-specific. |
| 103 | echo hi |
| 104 | echo $_ |
| 105 | ## stdout-json: "hi\nhi\n" |
| 106 | ## N-I dash/mksh stdout-json: "hi\n\n" |
| 107 | |
| 108 | #### $$ looks like a PID |
| 109 | # Just test that it has decimal digits |
| 110 | echo $$ | egrep '[0-9]+' |
| 111 | ## status: 0 |
| 112 | |
| 113 | #### $$ doesn't change with subshell or command sub |
| 114 | # Just test that it has decimal digits |
| 115 | set -o errexit |
| 116 | die() { |
| 117 | echo 1>&2 "$@"; exit 1 |
| 118 | } |
| 119 | parent=$$ |
| 120 | test -n "$parent" || die "empty PID in parent" |
| 121 | ( child=$$ |
| 122 | test -n "$child" || die "empty PID in subshell" |
| 123 | test "$parent" = "$child" || die "should be equal: $parent != $child" |
| 124 | echo 'subshell OK' |
| 125 | ) |
| 126 | echo $( child=$$ |
| 127 | test -n "$child" || die "empty PID in command sub" |
| 128 | test "$parent" = "$child" || die "should be equal: $parent != $child" |
| 129 | echo 'command sub OK' |
| 130 | ) |
| 131 | exit 3 # make sure we got here |
| 132 | ## status: 3 |
| 133 | ## STDOUT: |
| 134 | subshell OK |
| 135 | command sub OK |
| 136 | ## END |
| 137 | |
| 138 | #### $BASHPID DOES change with subshell and command sub |
| 139 | set -o errexit |
| 140 | die() { |
| 141 | echo 1>&2 "$@"; exit 1 |
| 142 | } |
| 143 | parent=$BASHPID |
| 144 | test -n "$parent" || die "empty BASHPID in parent" |
| 145 | ( child=$BASHPID |
| 146 | test -n "$child" || die "empty BASHPID in subshell" |
| 147 | test "$parent" != "$child" || die "should not be equal: $parent = $child" |
| 148 | echo 'subshell OK' |
| 149 | ) |
| 150 | echo $( child=$BASHPID |
| 151 | test -n "$child" || die "empty BASHPID in command sub" |
| 152 | test "$parent" != "$child" || |
| 153 | die "should not be equal: $parent = $child" |
| 154 | echo 'command sub OK' |
| 155 | ) |
| 156 | exit 3 # make sure we got here |
| 157 | |
| 158 | # mksh also implements BASHPID! |
| 159 | |
| 160 | ## status: 3 |
| 161 | ## STDOUT: |
| 162 | subshell OK |
| 163 | command sub OK |
| 164 | ## END |
| 165 | ## N-I dash/zsh status: 1 |
| 166 | ## N-I dash/zsh stdout-json: "" |
| 167 | |
| 168 | #### Background PID $! looks like a PID |
| 169 | sleep 0.01 & |
| 170 | pid=$! |
| 171 | wait |
| 172 | echo $pid | egrep '[0-9]+' >/dev/null |
| 173 | echo status=$? |
| 174 | ## stdout: status=0 |
| 175 | |
| 176 | #### $PPID |
| 177 | echo $PPID | egrep '[0-9]+' |
| 178 | ## status: 0 |
| 179 | |
| 180 | # NOTE: There is also $BASHPID |
| 181 | |
| 182 | #### $PIPESTATUS |
| 183 | echo hi | sh -c 'cat; exit 33' | wc -l >/dev/null |
| 184 | argv.py "${PIPESTATUS[@]}" |
| 185 | ## status: 0 |
| 186 | ## STDOUT: |
| 187 | ['0', '33', '0'] |
| 188 | ## END |
| 189 | ## N-I dash stdout-json: "" |
| 190 | ## N-I dash status: 2 |
| 191 | ## N-I zsh STDOUT: |
| 192 | [''] |
| 193 | ## END |
| 194 | |
| 195 | #### $RANDOM |
| 196 | expr $0 : '.*/osh$' && exit 99 # Disabled because of spec-runner.sh issue |
| 197 | echo $RANDOM | egrep '[0-9]+' |
| 198 | ## status: 0 |
| 199 | ## N-I dash status: 1 |
| 200 | |
| 201 | #### $UID and $EUID |
| 202 | # These are both bash-specific. |
| 203 | set -o errexit |
| 204 | echo $UID | egrep -o '[0-9]+' >/dev/null |
| 205 | echo $EUID | egrep -o '[0-9]+' >/dev/null |
| 206 | echo status=$? |
| 207 | ## stdout: status=0 |
| 208 | ## N-I dash/mksh stdout-json: "" |
| 209 | ## N-I dash/mksh status: 1 |
| 210 | |
| 211 | #### $OSTYPE is non-empty |
| 212 | test -n "$OSTYPE" |
| 213 | echo status=$? |
| 214 | ## STDOUT: |
| 215 | status=0 |
| 216 | ## END |
| 217 | ## N-I dash/mksh STDOUT: |
| 218 | status=1 |
| 219 | ## END |
| 220 | |
| 221 | #### $HOSTNAME |
| 222 | test "$HOSTNAME" = "$(hostname)" |
| 223 | echo status=$? |
| 224 | ## STDOUT: |
| 225 | status=0 |
| 226 | ## END |
| 227 | ## N-I dash/mksh/zsh STDOUT: |
| 228 | status=1 |
| 229 | ## END |
| 230 | |
| 231 | #### $LINENO is the current line, not line of function call |
| 232 | echo $LINENO # first line |
| 233 | g() { |
| 234 | argv.py $LINENO # line 3 |
| 235 | } |
| 236 | f() { |
| 237 | argv.py $LINENO # line 6 |
| 238 | g |
| 239 | argv.py $LINENO # line 8 |
| 240 | } |
| 241 | f |
| 242 | ## STDOUT: |
| 243 | 1 |
| 244 | ['6'] |
| 245 | ['3'] |
| 246 | ['8'] |
| 247 | ## END |
| 248 | ## BUG zsh STDOUT: |
| 249 | 1 |
| 250 | ['1'] |
| 251 | ['1'] |
| 252 | ['3'] |
| 253 | ## END |
| 254 | ## BUG dash STDOUT: |
| 255 | 1 |
| 256 | ['2'] |
| 257 | ['2'] |
| 258 | ['4'] |
| 259 | ## END |
| 260 | |
| 261 | #### $LINENO in "bare" redirect arg (bug regression) |
| 262 | filename=$TMP/bare3 |
| 263 | rm -f $filename |
| 264 | > $TMP/bare$LINENO |
| 265 | test -f $filename && echo written |
| 266 | echo $LINENO |
| 267 | ## STDOUT: |
| 268 | written |
| 269 | 5 |
| 270 | ## END |
| 271 | ## BUG zsh STDOUT: |
| 272 | ## END |
| 273 | |
| 274 | #### $LINENO in redirect arg (bug regression) |
| 275 | filename=$TMP/lineno_regression3 |
| 276 | rm -f $filename |
| 277 | echo x > $TMP/lineno_regression$LINENO |
| 278 | test -f $filename && echo written |
| 279 | echo $LINENO |
| 280 | ## STDOUT: |
| 281 | written |
| 282 | 5 |
| 283 | ## END |
| 284 | |
| 285 | #### $LINENO for [[ |
| 286 | echo one |
| 287 | [[ $LINENO -eq 2 ]] && echo OK |
| 288 | ## STDOUT: |
| 289 | one |
| 290 | OK |
| 291 | ## END |
| 292 | ## N-I dash status: 127 |
| 293 | ## N-I dash stdout: one |
| 294 | ## N-I mksh status: 1 |
| 295 | ## N-I mksh stdout: one |
| 296 | |
| 297 | #### $LINENO for (( |
| 298 | echo one |
| 299 | (( x = LINENO )) |
| 300 | echo $x |
| 301 | ## STDOUT: |
| 302 | one |
| 303 | 2 |
| 304 | ## END |
| 305 | ## N-I dash stdout-json: "one\n\n" |
| 306 | |
| 307 | #### $LINENO in for loop |
| 308 | # hm bash doesn't take into account the word break. That's OK; we won't either. |
| 309 | echo one |
| 310 | for x in \ |
| 311 | $LINENO zzz; do |
| 312 | echo $x |
| 313 | done |
| 314 | ## STDOUT: |
| 315 | one |
| 316 | 2 |
| 317 | zzz |
| 318 | ## END |
| 319 | ## OK mksh STDOUT: |
| 320 | one |
| 321 | 1 |
| 322 | zzz |
| 323 | ## END |
| 324 | |
| 325 | #### $LINENO in other for loops |
| 326 | set -- a b c |
| 327 | for x; do |
| 328 | echo $LINENO $x |
| 329 | done |
| 330 | ## STDOUT: |
| 331 | 3 a |
| 332 | 3 b |
| 333 | 3 c |
| 334 | ## END |
| 335 | |
| 336 | #### $LINENO in for (( loop |
| 337 | # This is a real edge case that I'm not sure we care about. We would have to |
| 338 | # change the span ID inside the loop to make it really correct. |
| 339 | echo one |
| 340 | for (( i = 0; i < $LINENO; i++ )); do |
| 341 | echo $i |
| 342 | done |
| 343 | ## STDOUT: |
| 344 | one |
| 345 | 0 |
| 346 | 1 |
| 347 | ## END |
| 348 | ## N-I dash stdout: one |
| 349 | ## N-I dash status: 2 |
| 350 | ## BUG mksh stdout: one |
| 351 | ## BUG mksh status: 1 |
| 352 | |
| 353 | #### $LINENO for assignment |
| 354 | a1=$LINENO a2=$LINENO |
| 355 | b1=$LINENO b2=$LINENO |
| 356 | echo $a1 $a2 |
| 357 | echo $b1 $b2 |
| 358 | ## STDOUT: |
| 359 | 1 1 |
| 360 | 2 2 |
| 361 | ## END |
| 362 | |
| 363 | |
| 364 | #### $_ |
| 365 | : 1 |
| 366 | echo $_ |
| 367 | : 'foo'"bar" |
| 368 | echo $_ |
| 369 | ## STDOUT: |
| 370 | 1 |
| 371 | foobar |
| 372 | ## END |
| 373 | ## N-I dash/mksh stdout-json: "\n\n" |
| 374 | |
| 375 | #### $_ with assignments, arrays, etc. |
| 376 | case $SH in (dash|mksh) exit ;; esac |
| 377 | |
| 378 | : foo |
| 379 | echo $_ |
| 380 | |
| 381 | s=bar |
| 382 | echo s:$_ |
| 383 | |
| 384 | # zsh uses declare; bash uses s=bar |
| 385 | declare s=bar |
| 386 | echo s:$_ |
| 387 | |
| 388 | # zsh remains s:declare, bash resets it |
| 389 | a=(1 2) |
| 390 | echo a:$_ |
| 391 | |
| 392 | # zsh sets it to declare, bash uses the LHS a |
| 393 | declare a=(1 2) |
| 394 | echo a:$_ |
| 395 | |
| 396 | declare -g a=(1 2) |
| 397 | echo flag:$_ |
| 398 | |
| 399 | ## STDOUT: |
| 400 | foo |
| 401 | s: |
| 402 | s:s=bar |
| 403 | a: |
| 404 | a:a |
| 405 | flag:a |
| 406 | ## END |
| 407 | ## OK zsh STDOUT: |
| 408 | foo |
| 409 | s: |
| 410 | s:declare |
| 411 | a:s:declare |
| 412 | a:declare |
| 413 | flag:-g |
| 414 | ## END |
| 415 | ## N-I dash/mksh stdout-json: "" |
| 416 | |
| 417 | #### $_ undefined |
| 418 | set -e |
| 419 | |
| 420 | # seems to be set to $0 at first, interesting. |
| 421 | x=$($SH -u -c 'echo $_') |
| 422 | test -n "$x" |
| 423 | echo nonempty=$? |
| 424 | ## STDOUT: |
| 425 | nonempty=0 |
| 426 | ## END |
| 427 | ## OK zsh status: 1 |
| 428 | ## OK zsh stdout-json: "" |
| 429 | ## N-I dash status: 2 |
| 430 | ## N-I dash stdout-json: "" |
| 431 | |
| 432 | #### BASH_VERSION / OIL_VERSION |
| 433 | case $SH in |
| 434 | (bash) |
| 435 | # BASH_VERSION=zz |
| 436 | |
| 437 | echo $BASH_VERSION | egrep -o '4\.4\.0' > /dev/null |
| 438 | echo matched=$? |
| 439 | ;; |
| 440 | (*osh) |
| 441 | # note: version string is mutable like in bash. I guess that's useful for |
| 442 | # testing? We might want a strict mode to eliminate that? |
| 443 | |
| 444 | echo $OIL_VERSION | egrep -o '[0-9]\.[0-9]\.' > /dev/null |
| 445 | echo matched=$? |
| 446 | ;; |
| 447 | (*) |
| 448 | echo 'no version' |
| 449 | ;; |
| 450 | esac |
| 451 | ## STDOUT: |
| 452 | matched=0 |
| 453 | ## END |
| 454 | ## N-I dash/mksh/zsh STDOUT: |
| 455 | no version |
| 456 | ## END |