| 1 | ## compare_shells: bash dash mksh zsh
|
| 2 |
|
| 3 |
|
| 4 | # Interesting interpretation of constants.
|
| 5 | #
|
| 6 | # "Constants with a leading 0 are interpreted as octal numbers. A leading ‘0x’
|
| 7 | # or ‘0X’ denotes hexadecimal. Otherwise, numbers take the form [base#]n, where
|
| 8 | # the optional base is a decimal number between 2 and 64 representing the
|
| 9 | # arithmetic base, and n is a number in that base. If base# is omitted, then
|
| 10 | # base 10 is used. When specifying n, the digits greater than 9 are represented
|
| 11 | # by the lowercase letters, the uppercase letters, ‘@’, and ‘_’, in that order.
|
| 12 | # If base is less than or equal to 36, lowercase and uppercase letters may be
|
| 13 | # used interchangeably to represent numbers between 10 and 35. "
|
| 14 | #
|
| 15 | # NOTE $(( 8#9 )) can fail, and this can be done at parse time...
|
| 16 |
|
| 17 | #### Side Effect in Array Indexing
|
| 18 | a=(4 5 6)
|
| 19 | echo "${a[b=2]} b=$b"
|
| 20 | ## stdout: 6 b=2
|
| 21 | ## OK zsh stdout: 5 b=2
|
| 22 | ## N-I dash stdout-json: ""
|
| 23 | ## N-I dash status: 2
|
| 24 |
|
| 25 | #### Add one to var
|
| 26 | i=1
|
| 27 | echo $(($i+1))
|
| 28 | ## stdout: 2
|
| 29 |
|
| 30 | #### $ is optional
|
| 31 | i=1
|
| 32 | echo $((i+1))
|
| 33 | ## stdout: 2
|
| 34 |
|
| 35 | #### SimpleVarSub within arith
|
| 36 | j=0
|
| 37 | echo $(($j + 42))
|
| 38 | ## stdout: 42
|
| 39 |
|
| 40 | #### BracedVarSub within ArithSub
|
| 41 | echo $((${j:-5} + 1))
|
| 42 | ## stdout: 6
|
| 43 |
|
| 44 | #### Arith word part
|
| 45 | foo=1; echo $((foo+1))bar$(($foo+1))
|
| 46 | ## stdout: 2bar2
|
| 47 |
|
| 48 | #### Arith sub with word parts
|
| 49 | # Making 13 from two different kinds of sub. Geez.
|
| 50 | echo $((1 + $(echo 1)${undefined:-3}))
|
| 51 | ## stdout: 14
|
| 52 |
|
| 53 | #### Constant with quotes like '1'
|
| 54 | # NOTE: Compare with [[. That is a COMMAND level expression, while this is a
|
| 55 | # WORD level expression.
|
| 56 | echo $(('1' + 2))
|
| 57 | ## status: 0
|
| 58 | ## N-I bash/zsh status: 1
|
| 59 | ## N-I dash status: 2
|
| 60 |
|
| 61 | #### Arith sub within arith sub
|
| 62 | # This is unnecessary but works in all shells.
|
| 63 | echo $((1 + $((2 + 3)) + 4))
|
| 64 | ## stdout: 10
|
| 65 |
|
| 66 | #### Backticks within arith sub
|
| 67 | # This is unnecessary but works in all shells.
|
| 68 | echo $((`echo 1` + 2))
|
| 69 | ## stdout: 3
|
| 70 |
|
| 71 | #### Invalid string to int
|
| 72 | # bash, mksh, and zsh all treat strings that don't look like numbers as zero.
|
| 73 | shopt -u strict_arith || true
|
| 74 | s=foo
|
| 75 | echo $((s+5))
|
| 76 | ## OK dash stdout-json: ""
|
| 77 | ## OK dash status: 2
|
| 78 | ## OK bash/mksh/zsh/osh stdout: 5
|
| 79 | ## OK bash/mksh/zsh/osh status: 0
|
| 80 |
|
| 81 | #### Invalid string to int with strict_arith
|
| 82 | shopt -s strict_arith || true
|
| 83 | s=foo
|
| 84 | echo $s
|
| 85 | echo $((s+5))
|
| 86 | echo 'should not get here'
|
| 87 | ## status: 1
|
| 88 | ## STDOUT:
|
| 89 | foo
|
| 90 | ## END
|
| 91 | ## OK dash status: 2
|
| 92 | ## N-I bash/mksh/zsh STDOUT:
|
| 93 | foo
|
| 94 | 5
|
| 95 | should not get here
|
| 96 | ## END
|
| 97 | ## N-I bash/mksh/zsh status: 0
|
| 98 |
|
| 99 | #### Integer constant parsing
|
| 100 | echo $(( 0x12A ))
|
| 101 | echo $(( 0x0A ))
|
| 102 | echo $(( 0777 ))
|
| 103 | echo $(( 0010 ))
|
| 104 | echo $(( 24#ag7 ))
|
| 105 | ## STDOUT:
|
| 106 | 298
|
| 107 | 10
|
| 108 | 511
|
| 109 | 8
|
| 110 | 6151
|
| 111 | ## END
|
| 112 |
|
| 113 | ## N-I dash status: 2
|
| 114 | ## N-I dash STDOUT:
|
| 115 | 298
|
| 116 | 10
|
| 117 | 511
|
| 118 | 8
|
| 119 | ## END
|
| 120 |
|
| 121 | ## BUG zsh STDOUT:
|
| 122 | 298
|
| 123 | 10
|
| 124 | 777
|
| 125 | 10
|
| 126 | 6151
|
| 127 | ## END
|
| 128 |
|
| 129 | ## BUG mksh STDOUT:
|
| 130 | 298
|
| 131 | 10
|
| 132 | 777
|
| 133 | 10
|
| 134 | 6151
|
| 135 | ## END
|
| 136 |
|
| 137 | #### Integer constant validation
|
| 138 | check() {
|
| 139 | $SH -c "shopt --set strict_arith; echo $1"
|
| 140 | echo status=$?
|
| 141 | }
|
| 142 |
|
| 143 | check '$(( 0x1X ))'
|
| 144 | check '$(( 09 ))'
|
| 145 | check '$(( 2#A ))'
|
| 146 | check '$(( 02#0110 ))'
|
| 147 | ## STDOUT:
|
| 148 | status=1
|
| 149 | status=1
|
| 150 | status=1
|
| 151 | status=1
|
| 152 | ## END
|
| 153 |
|
| 154 | ## OK dash STDOUT:
|
| 155 | status=2
|
| 156 | status=2
|
| 157 | status=2
|
| 158 | status=2
|
| 159 | ## END
|
| 160 |
|
| 161 | ## BUG zsh STDOUT:
|
| 162 | status=1
|
| 163 | 9
|
| 164 | status=0
|
| 165 | status=1
|
| 166 | 6
|
| 167 | status=0
|
| 168 | ## END
|
| 169 |
|
| 170 | ## BUG mksh STDOUT:
|
| 171 | status=1
|
| 172 | 9
|
| 173 | status=0
|
| 174 | status=1
|
| 175 | 6
|
| 176 | status=0
|
| 177 | ## END
|
| 178 |
|
| 179 | #### Newline in the middle of expression
|
| 180 | echo $((1
|
| 181 | + 2))
|
| 182 | ## stdout: 3
|
| 183 |
|
| 184 | #### Ternary operator
|
| 185 | a=1
|
| 186 | b=2
|
| 187 | echo $((a>b?5:10))
|
| 188 | ## stdout: 10
|
| 189 |
|
| 190 | #### Preincrement
|
| 191 | a=4
|
| 192 | echo $((++a))
|
| 193 | echo $a
|
| 194 | ## stdout-json: "5\n5\n"
|
| 195 | ## N-I dash status: 0
|
| 196 | ## N-I dash stdout-json: "4\n4\n"
|
| 197 |
|
| 198 | #### Postincrement
|
| 199 | a=4
|
| 200 | echo $((a++))
|
| 201 | echo $a
|
| 202 | ## stdout-json: "4\n5\n"
|
| 203 | ## N-I dash status: 2
|
| 204 | ## N-I dash stdout-json: ""
|
| 205 |
|
| 206 | #### Increment undefined variables
|
| 207 | shopt -u strict_arith || true
|
| 208 | (( undef1++ ))
|
| 209 | (( ++undef2 ))
|
| 210 | echo "[$undef1][$undef2]"
|
| 211 | ## stdout: [1][1]
|
| 212 | ## N-I dash stdout: [][]
|
| 213 |
|
| 214 | #### Increment and decrement array elements
|
| 215 | shopt -u strict_arith || true
|
| 216 | a=(5 6 7 8)
|
| 217 | (( a[0]++, ++a[1], a[2]--, --a[3] ))
|
| 218 | (( undef[0]++, ++undef[1], undef[2]--, --undef[3] ))
|
| 219 | echo "${a[@]}" - "${undef[@]}"
|
| 220 | ## stdout: 6 7 6 7 - 1 1 -1 -1
|
| 221 | ## N-I dash stdout-json: ""
|
| 222 | ## N-I dash status: 2
|
| 223 | ## BUG zsh stdout: 5 6 7 8 -
|
| 224 |
|
| 225 | #### Increment undefined variables with nounset
|
| 226 | set -o nounset
|
| 227 | (( undef1++ ))
|
| 228 | (( ++undef2 ))
|
| 229 | echo "[$undef1][$undef2]"
|
| 230 | ## stdout-json: ""
|
| 231 | ## status: 1
|
| 232 | ## OK dash status: 2
|
| 233 | ## BUG mksh/zsh status: 0
|
| 234 | ## BUG mksh/zsh stdout-json: "[1][1]\n"
|
| 235 |
|
| 236 | #### Comma operator (borrowed from C)
|
| 237 | a=1
|
| 238 | b=2
|
| 239 | echo $((a,(b+1)))
|
| 240 | ## stdout: 3
|
| 241 | ## N-I dash status: 2
|
| 242 | ## N-I dash stdout-json: ""
|
| 243 |
|
| 244 | #### Augmented assignment
|
| 245 | a=4
|
| 246 | echo $((a+=1))
|
| 247 | echo $a
|
| 248 | ## stdout-json: "5\n5\n"
|
| 249 |
|
| 250 | #### Comparison Ops
|
| 251 | echo $(( 1 == 1 ))
|
| 252 | echo $(( 1 != 1 ))
|
| 253 | echo $(( 1 < 1 ))
|
| 254 | echo $(( 1 <= 1 ))
|
| 255 | echo $(( 1 > 1 ))
|
| 256 | echo $(( 1 >= 1 ))
|
| 257 | ## stdout-json: "1\n0\n0\n1\n0\n1\n"
|
| 258 |
|
| 259 | #### Logical Ops
|
| 260 | echo $((1 || 2))
|
| 261 | echo $((1 && 2))
|
| 262 | echo $((!(1 || 2)))
|
| 263 | ## stdout-json: "1\n1\n0\n"
|
| 264 |
|
| 265 | #### Logical Ops Short Circuit
|
| 266 | x=11
|
| 267 | (( 1 || (x = 22) ))
|
| 268 | echo $x
|
| 269 | (( 0 || (x = 33) ))
|
| 270 | echo $x
|
| 271 | (( 0 && (x = 44) ))
|
| 272 | echo $x
|
| 273 | (( 1 && (x = 55) ))
|
| 274 | echo $x
|
| 275 | ## stdout-json: "11\n33\n33\n55\n"
|
| 276 | ## N-I dash stdout-json: "11\n11\n11\n11\n"
|
| 277 |
|
| 278 | #### Bitwise ops
|
| 279 | echo $((1|2))
|
| 280 | echo $((1&2))
|
| 281 | echo $((1^2))
|
| 282 | echo $((~(1|2)))
|
| 283 | ## stdout-json: "3\n0\n3\n-4\n"
|
| 284 |
|
| 285 | #### Unary minus and plus
|
| 286 | a=1
|
| 287 | b=3
|
| 288 | echo $((- a + + b))
|
| 289 | ## stdout-json: "2\n"
|
| 290 |
|
| 291 | #### No floating point
|
| 292 | echo $((1 + 2.3))
|
| 293 | ## status: 2
|
| 294 | ## OK bash/mksh status: 1
|
| 295 | ## BUG zsh status: 0
|
| 296 |
|
| 297 | #### Array indexing in arith
|
| 298 | # zsh does 1-based indexing!
|
| 299 | array=(1 2 3 4)
|
| 300 | echo $((array[1] + array[2]*3))
|
| 301 | ## stdout: 11
|
| 302 | ## OK zsh stdout: 7
|
| 303 | ## N-I dash status: 2
|
| 304 | ## N-I dash stdout-json: ""
|
| 305 |
|
| 306 | #### Constants in base 36
|
| 307 | echo $((36#a))-$((36#z))
|
| 308 | ## stdout: 10-35
|
| 309 | ## N-I dash stdout-json: ""
|
| 310 | ## N-I dash status: 2
|
| 311 |
|
| 312 | #### Constants in bases 2 to 64
|
| 313 | # This is a truly bizarre syntax. Oh it comes from zsh... which allows 36.
|
| 314 | echo $((64#a))-$((64#z)), $((64#A))-$((64#Z)), $((64#@)), $(( 64#_ ))
|
| 315 | ## stdout: 10-35, 36-61, 62, 63
|
| 316 | ## N-I dash stdout-json: ""
|
| 317 | ## N-I dash status: 2
|
| 318 | ## N-I mksh/zsh stdout-json: ""
|
| 319 | ## N-I mksh/zsh status: 1
|
| 320 |
|
| 321 | #### Multiple digit constants with base N
|
| 322 | echo $((10#0123)), $((16#1b))
|
| 323 | ## stdout: 123, 27
|
| 324 | ## N-I dash stdout-json: ""
|
| 325 | ## N-I dash status: 2
|
| 326 |
|
| 327 | #### Dynamic base constants
|
| 328 | base=16
|
| 329 | echo $(( ${base}#a ))
|
| 330 | ## stdout: 10
|
| 331 | ## N-I dash stdout-json: ""
|
| 332 | ## N-I dash status: 2
|
| 333 |
|
| 334 | #### Octal constant
|
| 335 | echo $(( 011 ))
|
| 336 | ## stdout: 9
|
| 337 | ## N-I mksh/zsh stdout: 11
|
| 338 |
|
| 339 | #### Dynamic octal constant
|
| 340 | zero=0
|
| 341 | echo $(( ${zero}11 ))
|
| 342 | ## stdout: 9
|
| 343 | ## N-I mksh/zsh stdout: 11
|
| 344 |
|
| 345 | #### Dynamic hex constants
|
| 346 | zero=0
|
| 347 | echo $(( ${zero}xAB ))
|
| 348 | ## stdout: 171
|
| 349 |
|
| 350 | #### Dynamic var names - result of runtime parse/eval
|
| 351 | foo=5
|
| 352 | x=oo
|
| 353 | echo $(( foo + f$x + 1 ))
|
| 354 | ## stdout: 11
|
| 355 |
|
| 356 | #### Recursive name evaluation is a result of runtime parse/eval
|
| 357 | foo=5
|
| 358 | bar=foo
|
| 359 | spam=bar
|
| 360 | eggs=spam
|
| 361 | echo $((foo+1)) $((bar+1)) $((spam+1)) $((eggs+1))
|
| 362 | ## stdout: 6 6 6 6
|
| 363 | ## N-I dash stdout-json: ""
|
| 364 | ## N-I dash status: 2
|
| 365 |
|
| 366 | #### nounset with arithmetic
|
| 367 | set -o nounset
|
| 368 | x=$(( y + 5 ))
|
| 369 | echo "should not get here: x=${x:-<unset>}"
|
| 370 | ## stdout-json: ""
|
| 371 | ## status: 1
|
| 372 | ## BUG dash/mksh/zsh stdout: should not get here: x=5
|
| 373 | ## BUG dash/mksh/zsh status: 0
|
| 374 |
|
| 375 | #### 64-bit integer doesn't overflow
|
| 376 |
|
| 377 | a=$(( 1 << 31 ))
|
| 378 | echo $a
|
| 379 |
|
| 380 | b=$(( a + a ))
|
| 381 | echo $b
|
| 382 |
|
| 383 | c=$(( b + a ))
|
| 384 | echo $c
|
| 385 |
|
| 386 | x=$(( 1 << 62 ))
|
| 387 | y=$(( x - 1 ))
|
| 388 | echo "max positive = $(( x + y ))"
|
| 389 |
|
| 390 | #echo "overflow $(( x + x ))"
|
| 391 |
|
| 392 | ## STDOUT:
|
| 393 | 2147483648
|
| 394 | 4294967296
|
| 395 | 6442450944
|
| 396 | max positive = 9223372036854775807
|
| 397 | ## END
|
| 398 |
|
| 399 | # mksh still uses int!
|
| 400 | ## BUG mksh STDOUT:
|
| 401 | -2147483648
|
| 402 | 0
|
| 403 | -2147483648
|
| 404 | max positive = 2147483647
|
| 405 | ## END
|
| 406 |
|
| 407 | #### More 64-bit ops
|
| 408 | case $SH in dash) exit ;; esac
|
| 409 |
|
| 410 | #shopt -s strict_arith
|
| 411 |
|
| 412 | # This overflows - the extra 9 puts it above 2**31
|
| 413 | #echo $(( 12345678909 ))
|
| 414 |
|
| 415 | [[ 12345678909 = $(( 1 << 30 )) ]]
|
| 416 | echo eq=$?
|
| 417 | [[ 12345678909 = 12345678909 ]]
|
| 418 | echo eq=$?
|
| 419 |
|
| 420 | # Try both [ and [[
|
| 421 | [ 12345678909 -gt $(( 1 << 30 )) ]
|
| 422 | echo greater=$?
|
| 423 | [[ 12345678909 -gt $(( 1 << 30 )) ]]
|
| 424 | echo greater=$?
|
| 425 |
|
| 426 | [[ 12345678909 -ge $(( 1 << 30 )) ]]
|
| 427 | echo ge=$?
|
| 428 | [[ 12345678909 -ge 12345678909 ]]
|
| 429 | echo ge=$?
|
| 430 |
|
| 431 | [[ 12345678909 -le $(( 1 << 30 )) ]]
|
| 432 | echo le=$?
|
| 433 | [[ 12345678909 -le 12345678909 ]]
|
| 434 | echo le=$?
|
| 435 |
|
| 436 | ## STDOUT:
|
| 437 | eq=1
|
| 438 | eq=0
|
| 439 | greater=0
|
| 440 | greater=0
|
| 441 | ge=0
|
| 442 | ge=0
|
| 443 | le=1
|
| 444 | le=0
|
| 445 | ## END
|
| 446 | ## N-I dash STDOUT:
|
| 447 | ## END
|
| 448 | ## BUG mksh STDOUT:
|
| 449 | eq=1
|
| 450 | eq=0
|
| 451 | greater=1
|
| 452 | greater=1
|
| 453 | ge=1
|
| 454 | ge=0
|
| 455 | le=0
|
| 456 | le=0
|
| 457 | ## END
|
| 458 |
|
| 459 | # mksh still uses int!
|
| 460 |
|
| 461 | #### Invalid LValue
|
| 462 | a=9
|
| 463 | (( (a + 2) = 3 ))
|
| 464 | echo $a
|
| 465 | ## status: 2
|
| 466 | ## stdout-json: ""
|
| 467 | ## OK bash/mksh/zsh stdout: 9
|
| 468 | ## OK bash/mksh/zsh status: 0
|
| 469 | # dash doesn't implement assignment
|
| 470 | ## N-I dash status: 2
|
| 471 | ## N-I dash stdout-json: ""
|
| 472 |
|
| 473 | #### Invalid LValue that looks like array
|
| 474 | (( 1[2] = 3 ))
|
| 475 | echo "status=$?"
|
| 476 | ## status: 1
|
| 477 | ## stdout-json: ""
|
| 478 |
|
| 479 | ## OK bash stdout: status=1
|
| 480 | ## OK bash status: 0
|
| 481 |
|
| 482 | ## OK mksh/zsh stdout: status=2
|
| 483 | ## OK mksh/zsh status: 0
|
| 484 |
|
| 485 | ## N-I dash stdout: status=127
|
| 486 | ## N-I dash status: 0
|
| 487 |
|
| 488 | #### Invalid LValue: two sets of brackets
|
| 489 | (( a[1][2] = 3 ))
|
| 490 | echo "status=$?"
|
| 491 | # shells treat this as a NON-fatal error
|
| 492 | ## status: 2
|
| 493 | ## stdout-json: ""
|
| 494 | ## OK bash stdout: status=1
|
| 495 | ## OK mksh/zsh stdout: status=2
|
| 496 | ## OK bash/mksh/zsh status: 0
|
| 497 | # dash doesn't implement assignment
|
| 498 | ## N-I dash stdout: status=127
|
| 499 | ## N-I dash status: 0
|
| 500 |
|
| 501 | #### Operator Precedence
|
| 502 | echo $(( 1 + 2*3 - 8/2 ))
|
| 503 | ## stdout: 3
|
| 504 |
|
| 505 | #### Exponentiation with **
|
| 506 | echo $(( 3 ** 0 ))
|
| 507 | echo $(( 3 ** 1 ))
|
| 508 | echo $(( 3 ** 2 ))
|
| 509 | ## STDOUT:
|
| 510 | 1
|
| 511 | 3
|
| 512 | 9
|
| 513 | ## END
|
| 514 | ## N-I dash stdout-json: ""
|
| 515 | ## N-I dash status: 2
|
| 516 | ## N-I mksh stdout-json: ""
|
| 517 | ## N-I mksh status: 1
|
| 518 |
|
| 519 | #### Exponentiation operator has buggy precedence
|
| 520 | # NOTE: All shells agree on this, but R and Python give -9, which is more
|
| 521 | # mathematically correct.
|
| 522 | echo $(( -3 ** 2 ))
|
| 523 | ## stdout: 9
|
| 524 | ## N-I dash stdout-json: ""
|
| 525 | ## N-I dash status: 2
|
| 526 | ## N-I mksh stdout-json: ""
|
| 527 | ## N-I mksh status: 1
|
| 528 |
|
| 529 | #### Negative exponent
|
| 530 | # bash explicitly disallows negative exponents!
|
| 531 | echo $(( 2**-1 * 5 ))
|
| 532 | ## stdout-json: ""
|
| 533 | ## status: 1
|
| 534 | ## OK zsh stdout: 2.5
|
| 535 | ## OK zsh status: 0
|
| 536 | ## N-I dash stdout-json: ""
|
| 537 | ## N-I dash status: 2
|
| 538 |
|
| 539 | #### Comment not allowed in the middle of multiline arithmetic
|
| 540 | echo $((
|
| 541 | 1 +
|
| 542 | 2 + \
|
| 543 | 3
|
| 544 | ))
|
| 545 | echo $((
|
| 546 | 1 + 2 # not a comment
|
| 547 | ))
|
| 548 | (( a = 3 + 4 # comment
|
| 549 | ))
|
| 550 | echo [$a]
|
| 551 | ## status: 1
|
| 552 | ## STDOUT:
|
| 553 | 6
|
| 554 | ## END
|
| 555 | ## OK dash/osh status: 2
|
| 556 | ## OK bash STDOUT:
|
| 557 | 6
|
| 558 | []
|
| 559 | ## END
|
| 560 | ## OK bash status: 0
|
| 561 |
|
| 562 | #### Add integer to indexed array (a[0] decay)
|
| 563 | declare -a array=(1 2 3)
|
| 564 | echo $((array + 5))
|
| 565 | ## status: 0
|
| 566 | ## STDOUT:
|
| 567 | 6
|
| 568 | ## END
|
| 569 | ## N-I dash status: 2
|
| 570 | ## N-I dash stdout-json: ""
|
| 571 | ## N-I mksh/zsh status: 1
|
| 572 | ## N-I mksh/zsh stdout-json: ""
|
| 573 |
|
| 574 | #### Add integer to associative array (a[0] decay)
|
| 575 | typeset -A assoc
|
| 576 | assoc[0]=42
|
| 577 | echo $((assoc + 5))
|
| 578 | ## status: 0
|
| 579 | ## stdout: 47
|
| 580 | ## BUG dash status: 0
|
| 581 | ## BUG dash stdout: 5
|
| 582 |
|
| 583 | #### Double subscript
|
| 584 | a=(1 2 3)
|
| 585 | echo $(( a[1] ))
|
| 586 | echo $(( a[1][1] ))
|
| 587 | ## status: 1
|
| 588 | ## OK osh status: 2
|
| 589 | ## STDOUT:
|
| 590 | 2
|
| 591 | ## END
|
| 592 | ## N-I dash status: 2
|
| 593 | ## N-I dash stdout-json: ""
|
| 594 | ## OK zsh STDOUT:
|
| 595 | 1
|
| 596 | ## END
|
| 597 |
|
| 598 | #### result of ArithSub -- array[0] decay
|
| 599 | a=(4 5 6)
|
| 600 | echo declared
|
| 601 | b=$(( a ))
|
| 602 | echo $b
|
| 603 |
|
| 604 | ## status: 0
|
| 605 | ## STDOUT:
|
| 606 | declared
|
| 607 | 4
|
| 608 | ## END
|
| 609 | ## N-I dash status: 2
|
| 610 | ## N-I dash stdout-json: ""
|
| 611 | ## N-I zsh status: 1
|
| 612 | ## N-I zsh STDOUT:
|
| 613 | declared
|
| 614 | ## END
|
| 615 |
|
| 616 | #### result of ArithSub -- assoc[0] decay
|
| 617 | declare -A A=(['foo']=bar ['spam']=eggs)
|
| 618 | echo declared
|
| 619 | b=$(( A ))
|
| 620 | echo $b
|
| 621 |
|
| 622 | ## status: 0
|
| 623 | ## STDOUT:
|
| 624 | declared
|
| 625 | 0
|
| 626 | ## END
|
| 627 |
|
| 628 | ## N-I mksh status: 1
|
| 629 | ## N-I mksh stdout-json: ""
|
| 630 |
|
| 631 |
|
| 632 | ## N-I dash status: 2
|
| 633 | ## N-I dash stdout-json: ""
|
| 634 |
|
| 635 | #### comma operator
|
| 636 | a=(4 5 6)
|
| 637 |
|
| 638 | # zsh and osh can't evaluate the array like that
|
| 639 | # which is consistent with their behavior on $(( a ))
|
| 640 |
|
| 641 | echo $(( a, last = a[2], 42 ))
|
| 642 | echo last=$last
|
| 643 |
|
| 644 | ## status: 0
|
| 645 | ## STDOUT:
|
| 646 | 42
|
| 647 | last=6
|
| 648 | ## END
|
| 649 | ## N-I dash status: 2
|
| 650 | ## N-I dash stdout-json: ""
|
| 651 | ## N-I zsh status: 1
|
| 652 | ## N-I zsh stdout-json: ""
|
| 653 |
|
| 654 |
|
| 655 | #### assignment with dynamic var name
|
| 656 | foo=bar
|
| 657 | echo $(( x$foo = 42 ))
|
| 658 | echo xbar=$xbar
|
| 659 | ## STDOUT:
|
| 660 | 42
|
| 661 | xbar=42
|
| 662 | ## END
|
| 663 |
|
| 664 | #### array assignment with dynamic array name
|
| 665 | foo=bar
|
| 666 | echo $(( x$foo[5] = 42 ))
|
| 667 | echo 'xbar[5]='${xbar[5]}
|
| 668 | ## STDOUT:
|
| 669 | 42
|
| 670 | xbar[5]=42
|
| 671 | ## END
|
| 672 | ## BUG zsh STDOUT:
|
| 673 | 42
|
| 674 | xbar[5]=
|
| 675 | ## END
|
| 676 | ## N-I dash status: 2
|
| 677 | ## N-I dash stdout-json: ""
|
| 678 |
|
| 679 | #### unary assignment with dynamic var name
|
| 680 | foo=bar
|
| 681 | xbar=42
|
| 682 | echo $(( x$foo++ ))
|
| 683 | echo xbar=$xbar
|
| 684 | ## STDOUT:
|
| 685 | 42
|
| 686 | xbar=43
|
| 687 | ## END
|
| 688 | ## BUG dash status: 2
|
| 689 | ## BUG dash stdout-json: ""
|
| 690 |
|
| 691 | #### unary array assignment with dynamic var name
|
| 692 | foo=bar
|
| 693 | xbar[5]=42
|
| 694 | echo $(( x$foo[5]++ ))
|
| 695 | echo 'xbar[5]='${xbar[5]}
|
| 696 | ## STDOUT:
|
| 697 | 42
|
| 698 | xbar[5]=43
|
| 699 | ## END
|
| 700 | ## BUG zsh STDOUT:
|
| 701 | 0
|
| 702 | xbar[5]=42
|
| 703 | ## END
|
| 704 | ## N-I dash status: 2
|
| 705 | ## N-I dash stdout-json: ""
|
| 706 |
|
| 707 | #### Dynamic parsing of arithmetic
|
| 708 | e=1+2
|
| 709 | echo $(( e + 3 ))
|
| 710 | [[ e -eq 3 ]] && echo true
|
| 711 | [ e -eq 3 ]
|
| 712 | echo status=$?
|
| 713 | ## STDOUT:
|
| 714 | 6
|
| 715 | true
|
| 716 | status=2
|
| 717 | ## END
|
| 718 | ## BUG mksh STDOUT:
|
| 719 | 6
|
| 720 | true
|
| 721 | status=0
|
| 722 | ## END
|
| 723 | ## N-I dash status: 2
|
| 724 | ## N-I dash stdout-json: ""
|
| 725 |
|
| 726 | #### Dynamic parsing on empty string
|
| 727 | a=''
|
| 728 | echo $(( a ))
|
| 729 |
|
| 730 | a2=' '
|
| 731 | echo $(( a2 ))
|
| 732 | ## STDOUT:
|
| 733 | 0
|
| 734 | 0
|
| 735 | ## END
|
| 736 |
|
| 737 | #### nested ternary (bug fix)
|
| 738 | echo $((1?2?3:4:5))
|
| 739 | ## STDOUT:
|
| 740 | 3
|
| 741 | ## END
|
| 742 |
|
| 743 | #### 1 ? a=1 : b=2 ( bug fix)
|
| 744 | echo $((1 ? a=1 : 42 ))
|
| 745 | echo a=$a
|
| 746 |
|
| 747 | # this does NOT work
|
| 748 | #echo $((1 ? a=1 : b=2 ))
|
| 749 |
|
| 750 | ## STDOUT:
|
| 751 | 1
|
| 752 | a=1
|
| 753 | ## END
|
| 754 | ## BUG zsh stdout-json: ""
|
| 755 | ## BUG zsh status: 1
|
| 756 |
|
| 757 | #### Invalid constant
|
| 758 |
|
| 759 | echo $((a + x42))
|
| 760 | echo status=$?
|
| 761 |
|
| 762 | # weird asymmetry -- the above is a syntax error, but this isn't
|
| 763 | $SH -c 'echo $((a + 42x))'
|
| 764 | echo status=$?
|
| 765 |
|
| 766 | # regression
|
| 767 | echo $((a + 42x))
|
| 768 | echo status=$?
|
| 769 | ## status: 1
|
| 770 | ## STDOUT:
|
| 771 | 0
|
| 772 | status=0
|
| 773 | status=1
|
| 774 | ## END
|
| 775 | ## OK dash status: 2
|
| 776 | ## OK dash STDOUT:
|
| 777 | 0
|
| 778 | status=0
|
| 779 | status=2
|
| 780 | ## END
|
| 781 | ## BUG bash status: 0
|
| 782 | ## BUG bash STDOUT:
|
| 783 | 0
|
| 784 | status=0
|
| 785 | status=1
|
| 786 | status=1
|
| 787 | ## END
|
| 788 |
|
| 789 | #### Negative numbers with integer division /
|
| 790 |
|
| 791 | echo $(( 10 / 3))
|
| 792 | echo $((-10 / 3))
|
| 793 | echo $(( 10 / -3))
|
| 794 | echo $((-10 / -3))
|
| 795 |
|
| 796 | echo ---
|
| 797 |
|
| 798 | a=20
|
| 799 | : $(( a /= 3 ))
|
| 800 | echo $a
|
| 801 |
|
| 802 | a=-20
|
| 803 | : $(( a /= 3 ))
|
| 804 | echo $a
|
| 805 |
|
| 806 | a=20
|
| 807 | : $(( a /= -3 ))
|
| 808 | echo $a
|
| 809 |
|
| 810 | a=-20
|
| 811 | : $(( a /= -3 ))
|
| 812 | echo $a
|
| 813 |
|
| 814 | ## STDOUT:
|
| 815 | 3
|
| 816 | -3
|
| 817 | -3
|
| 818 | 3
|
| 819 | ---
|
| 820 | 6
|
| 821 | -6
|
| 822 | -6
|
| 823 | 6
|
| 824 | ## END
|
| 825 |
|
| 826 | #### Negative numbers with %
|
| 827 |
|
| 828 | echo $(( 10 % 3))
|
| 829 | echo $((-10 % 3))
|
| 830 | echo $(( 10 % -3))
|
| 831 | echo $((-10 % -3))
|
| 832 |
|
| 833 | ## STDOUT:
|
| 834 | 1
|
| 835 | -1
|
| 836 | 1
|
| 837 | -1
|
| 838 | ## END
|
| 839 |
|
| 840 | #### Negative numbers with bit shift
|
| 841 |
|
| 842 | echo $(( 5 << 1 ))
|
| 843 | echo $(( 5 << 0 ))
|
| 844 | $SH -c 'echo $(( 5 << -1 ))' # implementation defined - OSH fails
|
| 845 | echo ---
|
| 846 |
|
| 847 | echo $(( 16 >> 1 ))
|
| 848 | echo $(( 16 >> 0 ))
|
| 849 | $SH -c 'echo $(( 16 >> -1 ))' # not sure why this is zero
|
| 850 | $SH -c 'echo $(( 16 >> -2 ))' # also 0
|
| 851 | echo ---
|
| 852 |
|
| 853 | ## STDOUT:
|
| 854 | 10
|
| 855 | 5
|
| 856 | ---
|
| 857 | 8
|
| 858 | 16
|
| 859 | ---
|
| 860 | ## END
|
| 861 |
|
| 862 | ## OK bash/dash/zsh STDOUT:
|
| 863 | 10
|
| 864 | 5
|
| 865 | -9223372036854775808
|
| 866 | ---
|
| 867 | 8
|
| 868 | 16
|
| 869 | 0
|
| 870 | 0
|
| 871 | ---
|
| 872 | ## END
|
| 873 |
|
| 874 | ## BUG mksh STDOUT:
|
| 875 | 10
|
| 876 | 5
|
| 877 | -2147483648
|
| 878 | ---
|
| 879 | 8
|
| 880 | 16
|
| 881 | 0
|
| 882 | 0
|
| 883 | ---
|
| 884 | ## END
|
| 885 |
|
| 886 | #### undef[0]
|
| 887 | case $SH in dash) exit ;; esac
|
| 888 |
|
| 889 | echo ARITH $(( undef[0] ))
|
| 890 | echo status=$?
|
| 891 | echo
|
| 892 |
|
| 893 | (( undef[0] ))
|
| 894 | echo status=$?
|
| 895 | echo
|
| 896 |
|
| 897 | echo UNDEF ${undef[0]}
|
| 898 | echo status=$?
|
| 899 |
|
| 900 | ## STDOUT:
|
| 901 | ARITH 0
|
| 902 | status=0
|
| 903 |
|
| 904 | status=1
|
| 905 |
|
| 906 | UNDEF
|
| 907 | status=0
|
| 908 | ## END
|
| 909 | ## N-I dash STDOUT:
|
| 910 | ## END
|
| 911 |
|
| 912 | #### undef[0] with nounset
|
| 913 | case $SH in dash) exit ;; esac
|
| 914 |
|
| 915 | set -o nounset
|
| 916 | echo UNSET $(( undef[0] ))
|
| 917 | echo status=$?
|
| 918 |
|
| 919 | ## status: 1
|
| 920 | ## STDOUT:
|
| 921 | ## END
|
| 922 |
|
| 923 | ## N-I dash status: 0
|
| 924 |
|
| 925 | ## BUG mksh/zsh status: 0
|
| 926 | ## BUG mksh/zsh STDOUT:
|
| 927 | UNSET 0
|
| 928 | status=0
|
| 929 | ## END
|
| 930 |
|
| 931 | ## N-I dash STDOUT:
|
| 932 | ## END
|
| 933 |
|
| 934 | #### s[0] with string abc
|
| 935 | case $SH in dash) exit ;; esac
|
| 936 |
|
| 937 | s='abc'
|
| 938 | echo abc $(( s[0] )) $(( s[1] ))
|
| 939 | echo status=$?
|
| 940 | echo
|
| 941 |
|
| 942 | (( s[0] ))
|
| 943 | echo status=$?
|
| 944 | echo
|
| 945 |
|
| 946 | ## STDOUT:
|
| 947 | abc 0 0
|
| 948 | status=0
|
| 949 |
|
| 950 | status=1
|
| 951 |
|
| 952 | ## END
|
| 953 | ## N-I dash STDOUT:
|
| 954 | ## END
|
| 955 |
|
| 956 | #### s[0] with string 42
|
| 957 | case $SH in dash) exit ;; esac
|
| 958 |
|
| 959 | s='42'
|
| 960 | echo 42 $(( s[0] )) $(( s[1] ))
|
| 961 | echo status=$?
|
| 962 |
|
| 963 | ## STDOUT:
|
| 964 | 42 42 0
|
| 965 | status=0
|
| 966 | ## END
|
| 967 | ## N-I dash STDOUT:
|
| 968 | ## END
|
| 969 |
|
| 970 | ## BUG zsh STDOUT:
|
| 971 | 42 0 4
|
| 972 | status=0
|
| 973 | ## END
|
| 974 |
|
| 975 | #### s[0] with string '12 34'
|
| 976 |
|
| 977 | s='12 34'
|
| 978 | echo '12 34' $(( s[0] )) $(( s[1] ))
|
| 979 | echo status=$?
|
| 980 |
|
| 981 | ## status: 1
|
| 982 | ## STDOUT:
|
| 983 | ## END
|
| 984 |
|
| 985 | ## OK dash status: 2
|
| 986 |
|
| 987 | ## BUG zsh status: 0
|
| 988 | ## BUG zsh STDOUT:
|
| 989 | 12 34 0 1
|
| 990 | status=0
|
| 991 | ## END
|
| 992 |
|
| 993 | # bash prints an error, but doesn't fail
|
| 994 |
|
| 995 | ## BUG bash status: 0
|
| 996 | ## BUG bash STDOUT:
|
| 997 | status=1
|
| 998 | ## END
|