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