| 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 | #### Integer constant parsing
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| 100 | echo $(( 0x12A ))
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| 101 | echo $(( 0x0A ))
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| 102 | echo $(( 0777 ))
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| 103 | echo $(( 0010 ))
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| 104 | echo $(( 24#ag7 ))
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| 105 | ## STDOUT:
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| 106 | 298
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| 107 | 10
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| 108 | 511
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| 109 | 8
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| 110 | 6151
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| 111 | ## END
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| 112 |
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| 113 | ## N-I dash status: 2
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| 114 | ## N-I dash STDOUT:
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| 115 | 298
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| 116 | 10
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| 117 | 511
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| 118 | 8
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| 119 | ## END
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| 120 |
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| 121 | ## BUG zsh STDOUT:
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| 122 | 298
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| 123 | 10
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| 124 | 777
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| 125 | 10
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| 126 | 6151
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| 127 | ## END
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| 128 |
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| 129 | ## BUG mksh STDOUT:
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| 130 | 298
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| 131 | 10
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| 132 | 777
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| 133 | 10
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| 134 | 6151
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| 135 | ## END
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| 136 |
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| 137 | #### Integer constant validation
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| 138 | check() {
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| 139 | $SH -c "shopt --set strict_arith; echo $1"
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| 140 | echo status=$?
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| 141 | }
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| 142 |
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| 143 | check '$(( 0x1X ))'
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| 144 | check '$(( 09 ))'
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| 145 | check '$(( 2#A ))'
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| 146 | check '$(( 02#0110 ))'
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| 147 | ## STDOUT:
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| 148 | status=1
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| 149 | status=1
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| 150 | status=1
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| 151 | status=1
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| 152 | ## END
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| 153 |
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| 154 | ## OK dash STDOUT:
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| 155 | status=2
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| 156 | status=2
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| 157 | status=2
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| 158 | status=2
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| 159 | ## END
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| 160 |
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| 161 | ## BUG zsh STDOUT:
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| 162 | status=1
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| 163 | 9
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| 164 | status=0
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| 165 | status=1
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| 166 | 6
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| 167 | status=0
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| 168 | ## END
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| 169 |
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| 170 | ## BUG mksh STDOUT:
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| 171 | status=1
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| 172 | 9
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| 173 | status=0
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| 174 | status=1
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| 175 | 6
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| 176 | status=0
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| 177 | ## END
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| 178 |
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| 179 | #### Newline in the middle of expression
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| 180 | echo $((1
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| 181 | + 2))
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| 182 | ## stdout: 3
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| 183 |
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| 184 | #### Ternary operator
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| 185 | a=1
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| 186 | b=2
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| 187 | echo $((a>b?5:10))
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| 188 | ## stdout: 10
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| 189 |
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| 190 | #### Preincrement
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| 191 | a=4
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| 192 | echo $((++a))
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| 193 | echo $a
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| 194 | ## STDOUT:
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| 195 | 5
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| 196 | 5
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| 197 | ## END
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| 198 | ## N-I dash status: 0
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| 199 | ## N-I dash STDOUT:
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| 200 | 4
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| 201 | 4
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| 202 | ## END
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| 203 |
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| 204 | #### Postincrement
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| 205 | a=4
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| 206 | echo $((a++))
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| 207 | echo $a
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| 208 | ## STDOUT:
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| 209 | 4
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| 210 | 5
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| 211 | ## END
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| 212 | ## N-I dash status: 2
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| 213 | ## N-I dash stdout-json: ""
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| 214 |
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| 215 | #### Increment undefined variables
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| 216 | shopt -u strict_arith || true
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| 217 | (( undef1++ ))
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| 218 | (( ++undef2 ))
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| 219 | echo "[$undef1][$undef2]"
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| 220 | ## stdout: [1][1]
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| 221 | ## N-I dash stdout: [][]
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| 222 |
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| 223 | #### Increment and decrement array elements
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| 224 | shopt -u strict_arith || true
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| 225 | a=(5 6 7 8)
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| 226 | (( a[0]++, ++a[1], a[2]--, --a[3] ))
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| 227 | (( undef[0]++, ++undef[1], undef[2]--, --undef[3] ))
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| 228 | echo "${a[@]}" - "${undef[@]}"
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| 229 | ## stdout: 6 7 6 7 - 1 1 -1 -1
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| 230 | ## N-I dash stdout-json: ""
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| 231 | ## N-I dash status: 2
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| 232 | ## BUG zsh stdout: 5 6 7 8 -
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| 233 |
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| 234 | #### Increment undefined variables with nounset
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| 235 | set -o nounset
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| 236 | (( undef1++ ))
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| 237 | (( ++undef2 ))
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| 238 | echo "[$undef1][$undef2]"
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| 239 | ## stdout-json: ""
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| 240 | ## status: 1
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| 241 | ## OK dash status: 2
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| 242 | ## BUG mksh/zsh status: 0
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| 243 | ## BUG mksh/zsh STDOUT:
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| 244 | [1][1]
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| 245 | ## END
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| 246 |
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| 247 | #### Comma operator (borrowed from C)
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| 248 | a=1
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| 249 | b=2
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| 250 | echo $((a,(b+1)))
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| 251 | ## stdout: 3
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| 252 | ## N-I dash status: 2
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| 253 | ## N-I dash stdout-json: ""
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| 254 |
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| 255 | #### Augmented assignment
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| 256 | a=4
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| 257 | echo $((a+=1))
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| 258 | echo $a
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| 259 | ## STDOUT:
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| 260 | 5
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| 261 | 5
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| 262 | ## END
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| 263 |
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| 264 | #### Comparison Ops
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| 265 | echo $(( 1 == 1 ))
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| 266 | echo $(( 1 != 1 ))
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| 267 | echo $(( 1 < 1 ))
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| 268 | echo $(( 1 <= 1 ))
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| 269 | echo $(( 1 > 1 ))
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| 270 | echo $(( 1 >= 1 ))
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| 271 | ## STDOUT:
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| 272 | 1
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| 273 | 0
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| 274 | 0
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| 275 | 1
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| 276 | 0
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| 277 | 1
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| 278 | ## END
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| 279 |
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| 280 | #### Logical Ops
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| 281 | echo $((1 || 2))
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| 282 | echo $((1 && 2))
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| 283 | echo $((!(1 || 2)))
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| 284 | ## STDOUT:
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| 285 | 1
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| 286 | 1
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| 287 | 0
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| 288 | ## END
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| 289 |
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| 290 | #### Logical Ops Short Circuit
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| 291 | x=11
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| 292 | (( 1 || (x = 22) ))
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| 293 | echo $x
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| 294 | (( 0 || (x = 33) ))
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| 295 | echo $x
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| 296 | (( 0 && (x = 44) ))
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| 297 | echo $x
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| 298 | (( 1 && (x = 55) ))
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| 299 | echo $x
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| 300 | ## STDOUT:
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| 301 | 11
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| 302 | 33
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| 303 | 33
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| 304 | 55
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| 305 | ## END
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| 306 | ## N-I dash STDOUT:
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| 307 | 11
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| 308 | 11
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| 309 | 11
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| 310 | 11
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| 311 | ## END
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| 312 |
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| 313 | #### Bitwise ops
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| 314 | echo $((1|2))
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| 315 | echo $((1&2))
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| 316 | echo $((1^2))
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| 317 | echo $((~(1|2)))
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| 318 | ## STDOUT:
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| 319 | 3
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| 320 | 0
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| 321 | 3
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| 322 | -4
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| 323 | ## END
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| 324 |
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| 325 | #### Unary minus and plus
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| 326 | a=1
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| 327 | b=3
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| 328 | echo $((- a + + b))
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| 329 | ## STDOUT:
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| 330 | 2
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| 331 | ## END
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| 332 |
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| 333 | #### No floating point
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| 334 | echo $((1 + 2.3))
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| 335 | ## status: 2
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| 336 | ## OK bash/mksh status: 1
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| 337 | ## BUG zsh status: 0
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| 338 |
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| 339 | #### Array indexing in arith
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| 340 | # zsh does 1-based indexing!
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| 341 | array=(1 2 3 4)
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| 342 | echo $((array[1] + array[2]*3))
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| 343 | ## stdout: 11
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| 344 | ## OK zsh stdout: 7
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| 345 | ## N-I dash status: 2
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| 346 | ## N-I dash stdout-json: ""
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| 347 |
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| 348 | #### Constants in base 36
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| 349 | echo $((36#a))-$((36#z))
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| 350 | ## stdout: 10-35
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| 351 | ## N-I dash stdout-json: ""
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| 352 | ## N-I dash status: 2
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| 353 |
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| 354 | #### Constants in bases 2 to 64
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| 355 | # This is a truly bizarre syntax. Oh it comes from zsh... which allows 36.
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| 356 | echo $((64#a))-$((64#z)), $((64#A))-$((64#Z)), $((64#@)), $(( 64#_ ))
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| 357 | ## stdout: 10-35, 36-61, 62, 63
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| 358 | ## N-I dash stdout-json: ""
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| 359 | ## N-I dash status: 2
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| 360 | ## N-I mksh/zsh stdout-json: ""
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| 361 | ## N-I mksh/zsh status: 1
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| 362 |
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| 363 | #### Multiple digit constants with base N
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| 364 | echo $((10#0123)), $((16#1b))
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| 365 | ## stdout: 123, 27
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| 366 | ## N-I dash stdout-json: ""
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| 367 | ## N-I dash status: 2
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| 368 |
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| 369 | #### Dynamic base constants
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| 370 | base=16
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| 371 | echo $(( ${base}#a ))
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| 372 | ## stdout: 10
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| 373 | ## N-I dash stdout-json: ""
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| 374 | ## N-I dash status: 2
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| 375 |
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| 376 | #### Octal constant
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| 377 | echo $(( 011 ))
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| 378 | ## stdout: 9
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| 379 | ## N-I mksh/zsh stdout: 11
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| 380 |
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| 381 | #### Dynamic octal constant
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| 382 | zero=0
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| 383 | echo $(( ${zero}11 ))
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| 384 | ## stdout: 9
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| 385 | ## N-I mksh/zsh stdout: 11
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| 386 |
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| 387 | #### Dynamic hex constants
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| 388 | zero=0
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| 389 | echo $(( ${zero}xAB ))
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| 390 | ## stdout: 171
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| 391 |
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| 392 | #### Hex constant with capital X
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| 393 | echo $(( 0XAA ))
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| 394 | ## stdout: 170
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| 395 |
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| 396 | #### Dynamic var names - result of runtime parse/eval
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| 397 | foo=5
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| 398 | x=oo
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| 399 | echo $(( foo + f$x + 1 ))
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| 400 | ## stdout: 11
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| 401 |
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| 402 | #### Recursive name evaluation is a result of runtime parse/eval
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| 403 | foo=5
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| 404 | bar=foo
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| 405 | spam=bar
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| 406 | eggs=spam
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| 407 | echo $((foo+1)) $((bar+1)) $((spam+1)) $((eggs+1))
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| 408 | ## stdout: 6 6 6 6
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| 409 | ## N-I dash stdout-json: ""
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| 410 | ## N-I dash status: 2
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| 411 |
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| 412 | #### nounset with arithmetic
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| 413 | set -o nounset
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| 414 | x=$(( y + 5 ))
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| 415 | echo "should not get here: x=${x:-<unset>}"
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| 416 | ## stdout-json: ""
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| 417 | ## status: 1
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| 418 | ## BUG dash/mksh/zsh stdout: should not get here: x=5
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| 419 | ## BUG dash/mksh/zsh status: 0
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| 420 |
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| 421 | #### 64-bit integer doesn't overflow
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| 422 |
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| 423 | a=$(( 1 << 31 ))
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| 424 | echo $a
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| 425 |
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| 426 | b=$(( a + a ))
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| 427 | echo $b
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| 428 |
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| 429 | c=$(( b + a ))
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| 430 | echo $c
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| 431 |
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| 432 | x=$(( 1 << 62 ))
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| 433 | y=$(( x - 1 ))
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| 434 | echo "max positive = $(( x + y ))"
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| 435 |
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| 436 | #echo "overflow $(( x + x ))"
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| 437 |
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| 438 | ## STDOUT:
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| 439 | 2147483648
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| 440 | 4294967296
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| 441 | 6442450944
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| 442 | max positive = 9223372036854775807
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| 443 | ## END
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| 444 |
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| 445 | # mksh still uses int!
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| 446 | ## BUG mksh STDOUT:
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| 447 | -2147483648
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| 448 | 0
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| 449 | -2147483648
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| 450 | max positive = 2147483647
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| 451 | ## END
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| 452 |
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| 453 | #### More 64-bit ops
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| 454 | case $SH in dash) exit ;; esac
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| 455 |
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| 456 | #shopt -s strict_arith
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| 457 |
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| 458 | # This overflows - the extra 9 puts it above 2**31
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| 459 | #echo $(( 12345678909 ))
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| 460 |
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| 461 | [[ 12345678909 = $(( 1 << 30 )) ]]
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| 462 | echo eq=$?
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| 463 | [[ 12345678909 = 12345678909 ]]
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| 464 | echo eq=$?
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| 465 |
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| 466 | # Try both [ and [[
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| 467 | [ 12345678909 -gt $(( 1 << 30 )) ]
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| 468 | echo greater=$?
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| 469 | [[ 12345678909 -gt $(( 1 << 30 )) ]]
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| 470 | echo greater=$?
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| 471 |
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| 472 | [[ 12345678909 -ge $(( 1 << 30 )) ]]
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| 473 | echo ge=$?
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| 474 | [[ 12345678909 -ge 12345678909 ]]
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| 475 | echo ge=$?
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| 476 |
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| 477 | [[ 12345678909 -le $(( 1 << 30 )) ]]
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| 478 | echo le=$?
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| 479 | [[ 12345678909 -le 12345678909 ]]
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| 480 | echo le=$?
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| 481 |
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| 482 | ## STDOUT:
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| 483 | eq=1
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| 484 | eq=0
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| 485 | greater=0
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| 486 | greater=0
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| 487 | ge=0
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| 488 | ge=0
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| 489 | le=1
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| 490 | le=0
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| 491 | ## END
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| 492 | ## N-I dash STDOUT:
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| 493 | ## END
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| 494 | ## BUG mksh STDOUT:
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| 495 | eq=1
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| 496 | eq=0
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| 497 | greater=1
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| 498 | greater=1
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| 499 | ge=1
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| 500 | ge=0
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| 501 | le=0
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| 502 | le=0
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| 503 | ## END
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| 504 |
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| 505 | # mksh still uses int!
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| 506 |
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| 507 | #### Invalid LValue
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| 508 | a=9
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| 509 | (( (a + 2) = 3 ))
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| 510 | echo $a
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| 511 | ## status: 2
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| 512 | ## stdout-json: ""
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| 513 | ## OK bash/mksh/zsh stdout: 9
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| 514 | ## OK bash/mksh/zsh status: 0
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| 515 | # dash doesn't implement assignment
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| 516 | ## N-I dash status: 2
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| 517 | ## N-I dash stdout-json: ""
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| 518 |
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| 519 | #### Invalid LValue that looks like array
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| 520 | (( 1[2] = 3 ))
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| 521 | echo "status=$?"
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| 522 | ## status: 1
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| 523 | ## stdout-json: ""
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| 524 |
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| 525 | ## OK bash stdout: status=1
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| 526 | ## OK bash status: 0
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| 527 |
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| 528 | ## OK mksh/zsh stdout: status=2
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| 529 | ## OK mksh/zsh status: 0
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| 530 |
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| 531 | ## N-I dash stdout: status=127
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| 532 | ## N-I dash status: 0
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| 533 |
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| 534 | #### Invalid LValue: two sets of brackets
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| 535 | (( a[1][2] = 3 ))
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| 536 | echo "status=$?"
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| 537 | # shells treat this as a NON-fatal error
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| 538 | ## status: 2
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| 539 | ## stdout-json: ""
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| 540 | ## OK bash stdout: status=1
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| 541 | ## OK mksh/zsh stdout: status=2
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| 542 | ## OK bash/mksh/zsh status: 0
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| 543 | # dash doesn't implement assignment
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| 544 | ## N-I dash stdout: status=127
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| 545 | ## N-I dash status: 0
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| 546 |
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| 547 | #### Operator Precedence
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| 548 | echo $(( 1 + 2*3 - 8/2 ))
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| 549 | ## stdout: 3
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| 550 |
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| 551 | #### Exponentiation with **
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| 552 | echo $(( 3 ** 0 ))
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| 553 | echo $(( 3 ** 1 ))
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| 554 | echo $(( 3 ** 2 ))
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| 555 | ## STDOUT:
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| 556 | 1
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| 557 | 3
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| 558 | 9
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| 559 | ## END
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| 560 | ## N-I dash stdout-json: ""
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| 561 | ## N-I dash status: 2
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| 562 | ## N-I mksh stdout-json: ""
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| 563 | ## N-I mksh status: 1
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| 564 |
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| 565 | #### Exponentiation operator has buggy precedence
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| 566 | # NOTE: All shells agree on this, but R and Python give -9, which is more
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| 567 | # mathematically correct.
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| 568 | echo $(( -3 ** 2 ))
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| 569 | ## stdout: 9
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| 570 | ## N-I dash stdout-json: ""
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| 571 | ## N-I dash status: 2
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| 572 | ## N-I mksh stdout-json: ""
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| 573 | ## N-I mksh status: 1
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| 574 |
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| 575 | #### Negative exponent
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| 576 | # bash explicitly disallows negative exponents!
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| 577 | echo $(( 2**-1 * 5 ))
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| 578 | ## stdout-json: ""
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| 579 | ## status: 1
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| 580 | ## OK zsh stdout: 2.5
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| 581 | ## OK zsh status: 0
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| 582 | ## N-I dash stdout-json: ""
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| 583 | ## N-I dash status: 2
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| 584 |
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| 585 | #### Comment not allowed in the middle of multiline arithmetic
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| 586 | echo $((
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| 587 | 1 +
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| 588 | 2 + \
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| 589 | 3
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| 590 | ))
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| 591 | echo $((
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| 592 | 1 + 2 # not a comment
|
| 593 | ))
|
| 594 | (( a = 3 + 4 # comment
|
| 595 | ))
|
| 596 | echo [$a]
|
| 597 | ## status: 1
|
| 598 | ## STDOUT:
|
| 599 | 6
|
| 600 | ## END
|
| 601 | ## OK dash/osh status: 2
|
| 602 | ## OK bash STDOUT:
|
| 603 | 6
|
| 604 | []
|
| 605 | ## END
|
| 606 | ## OK bash status: 0
|
| 607 |
|
| 608 | #### Add integer to indexed array (a[0] decay)
|
| 609 | declare -a array=(1 2 3)
|
| 610 | echo $((array + 5))
|
| 611 | ## status: 0
|
| 612 | ## STDOUT:
|
| 613 | 6
|
| 614 | ## END
|
| 615 | ## N-I dash status: 2
|
| 616 | ## N-I dash stdout-json: ""
|
| 617 | ## N-I mksh/zsh status: 1
|
| 618 | ## N-I mksh/zsh stdout-json: ""
|
| 619 |
|
| 620 | #### Add integer to associative array (a[0] decay)
|
| 621 | typeset -A assoc
|
| 622 | assoc[0]=42
|
| 623 | echo $((assoc + 5))
|
| 624 | ## status: 0
|
| 625 | ## stdout: 47
|
| 626 | ## BUG dash status: 0
|
| 627 | ## BUG dash stdout: 5
|
| 628 |
|
| 629 | #### Double subscript
|
| 630 | a=(1 2 3)
|
| 631 | echo $(( a[1] ))
|
| 632 | echo $(( a[1][1] ))
|
| 633 | ## status: 1
|
| 634 | ## OK osh status: 2
|
| 635 | ## STDOUT:
|
| 636 | 2
|
| 637 | ## END
|
| 638 | ## N-I dash status: 2
|
| 639 | ## N-I dash stdout-json: ""
|
| 640 | ## OK zsh STDOUT:
|
| 641 | 1
|
| 642 | ## END
|
| 643 |
|
| 644 | #### result of ArithSub -- array[0] decay
|
| 645 | a=(4 5 6)
|
| 646 | echo declared
|
| 647 | b=$(( a ))
|
| 648 | echo $b
|
| 649 |
|
| 650 | ## status: 0
|
| 651 | ## STDOUT:
|
| 652 | declared
|
| 653 | 4
|
| 654 | ## END
|
| 655 | ## N-I dash status: 2
|
| 656 | ## N-I dash stdout-json: ""
|
| 657 | ## N-I zsh status: 1
|
| 658 | ## N-I zsh STDOUT:
|
| 659 | declared
|
| 660 | ## END
|
| 661 |
|
| 662 | #### result of ArithSub -- assoc[0] decay
|
| 663 | declare -A A=(['foo']=bar ['spam']=eggs)
|
| 664 | echo declared
|
| 665 | b=$(( A ))
|
| 666 | echo $b
|
| 667 |
|
| 668 | ## status: 0
|
| 669 | ## STDOUT:
|
| 670 | declared
|
| 671 | 0
|
| 672 | ## END
|
| 673 |
|
| 674 | ## N-I mksh status: 1
|
| 675 | ## N-I mksh stdout-json: ""
|
| 676 |
|
| 677 |
|
| 678 | ## N-I dash status: 2
|
| 679 | ## N-I dash stdout-json: ""
|
| 680 |
|
| 681 | #### comma operator
|
| 682 | a=(4 5 6)
|
| 683 |
|
| 684 | # zsh and osh can't evaluate the array like that
|
| 685 | # which is consistent with their behavior on $(( a ))
|
| 686 |
|
| 687 | echo $(( a, last = a[2], 42 ))
|
| 688 | echo last=$last
|
| 689 |
|
| 690 | ## status: 0
|
| 691 | ## STDOUT:
|
| 692 | 42
|
| 693 | last=6
|
| 694 | ## END
|
| 695 | ## N-I dash status: 2
|
| 696 | ## N-I dash stdout-json: ""
|
| 697 | ## N-I zsh status: 1
|
| 698 | ## N-I zsh stdout-json: ""
|
| 699 |
|
| 700 |
|
| 701 | #### assignment with dynamic var name
|
| 702 | foo=bar
|
| 703 | echo $(( x$foo = 42 ))
|
| 704 | echo xbar=$xbar
|
| 705 | ## STDOUT:
|
| 706 | 42
|
| 707 | xbar=42
|
| 708 | ## END
|
| 709 |
|
| 710 | #### array assignment with dynamic array name
|
| 711 | foo=bar
|
| 712 | echo $(( x$foo[5] = 42 ))
|
| 713 | echo 'xbar[5]='${xbar[5]}
|
| 714 | ## STDOUT:
|
| 715 | 42
|
| 716 | xbar[5]=42
|
| 717 | ## END
|
| 718 | ## BUG zsh STDOUT:
|
| 719 | 42
|
| 720 | xbar[5]=
|
| 721 | ## END
|
| 722 | ## N-I dash status: 2
|
| 723 | ## N-I dash stdout-json: ""
|
| 724 |
|
| 725 | #### unary assignment with dynamic var name
|
| 726 | foo=bar
|
| 727 | xbar=42
|
| 728 | echo $(( x$foo++ ))
|
| 729 | echo xbar=$xbar
|
| 730 | ## STDOUT:
|
| 731 | 42
|
| 732 | xbar=43
|
| 733 | ## END
|
| 734 | ## BUG dash status: 2
|
| 735 | ## BUG dash stdout-json: ""
|
| 736 |
|
| 737 | #### unary array assignment with dynamic var name
|
| 738 | foo=bar
|
| 739 | xbar[5]=42
|
| 740 | echo $(( x$foo[5]++ ))
|
| 741 | echo 'xbar[5]='${xbar[5]}
|
| 742 | ## STDOUT:
|
| 743 | 42
|
| 744 | xbar[5]=43
|
| 745 | ## END
|
| 746 | ## BUG zsh STDOUT:
|
| 747 | 0
|
| 748 | xbar[5]=42
|
| 749 | ## END
|
| 750 | ## N-I dash status: 2
|
| 751 | ## N-I dash stdout-json: ""
|
| 752 |
|
| 753 | #### Dynamic parsing of arithmetic
|
| 754 | e=1+2
|
| 755 | echo $(( e + 3 ))
|
| 756 | [[ e -eq 3 ]] && echo true
|
| 757 | [ e -eq 3 ]
|
| 758 | echo status=$?
|
| 759 | ## STDOUT:
|
| 760 | 6
|
| 761 | true
|
| 762 | status=2
|
| 763 | ## END
|
| 764 | ## BUG mksh STDOUT:
|
| 765 | 6
|
| 766 | true
|
| 767 | status=0
|
| 768 | ## END
|
| 769 | ## N-I dash status: 2
|
| 770 | ## N-I dash stdout-json: ""
|
| 771 |
|
| 772 | #### Dynamic parsing on empty string
|
| 773 | a=''
|
| 774 | echo $(( a ))
|
| 775 |
|
| 776 | a2=' '
|
| 777 | echo $(( a2 ))
|
| 778 | ## STDOUT:
|
| 779 | 0
|
| 780 | 0
|
| 781 | ## END
|
| 782 |
|
| 783 | #### nested ternary (bug fix)
|
| 784 | echo $((1?2?3:4:5))
|
| 785 | ## STDOUT:
|
| 786 | 3
|
| 787 | ## END
|
| 788 |
|
| 789 | #### 1 ? a=1 : b=2 ( bug fix)
|
| 790 | echo $((1 ? a=1 : 42 ))
|
| 791 | echo a=$a
|
| 792 |
|
| 793 | # this does NOT work
|
| 794 | #echo $((1 ? a=1 : b=2 ))
|
| 795 |
|
| 796 | ## STDOUT:
|
| 797 | 1
|
| 798 | a=1
|
| 799 | ## END
|
| 800 | ## BUG zsh stdout-json: ""
|
| 801 | ## BUG zsh status: 1
|
| 802 |
|
| 803 | #### Invalid constant
|
| 804 |
|
| 805 | echo $((a + x42))
|
| 806 | echo status=$?
|
| 807 |
|
| 808 | # weird asymmetry -- the above is a syntax error, but this isn't
|
| 809 | $SH -c 'echo $((a + 42x))'
|
| 810 | echo status=$?
|
| 811 |
|
| 812 | # regression
|
| 813 | echo $((a + 42x))
|
| 814 | echo status=$?
|
| 815 | ## status: 1
|
| 816 | ## STDOUT:
|
| 817 | 0
|
| 818 | status=0
|
| 819 | status=1
|
| 820 | ## END
|
| 821 | ## OK dash status: 2
|
| 822 | ## OK dash STDOUT:
|
| 823 | 0
|
| 824 | status=0
|
| 825 | status=2
|
| 826 | ## END
|
| 827 | ## BUG bash status: 0
|
| 828 | ## BUG bash STDOUT:
|
| 829 | 0
|
| 830 | status=0
|
| 831 | status=1
|
| 832 | status=1
|
| 833 | ## END
|
| 834 |
|
| 835 | #### Negative numbers with integer division /
|
| 836 |
|
| 837 | echo $(( 10 / 3))
|
| 838 | echo $((-10 / 3))
|
| 839 | echo $(( 10 / -3))
|
| 840 | echo $((-10 / -3))
|
| 841 |
|
| 842 | echo ---
|
| 843 |
|
| 844 | a=20
|
| 845 | : $(( a /= 3 ))
|
| 846 | echo $a
|
| 847 |
|
| 848 | a=-20
|
| 849 | : $(( a /= 3 ))
|
| 850 | echo $a
|
| 851 |
|
| 852 | a=20
|
| 853 | : $(( a /= -3 ))
|
| 854 | echo $a
|
| 855 |
|
| 856 | a=-20
|
| 857 | : $(( a /= -3 ))
|
| 858 | echo $a
|
| 859 |
|
| 860 | ## STDOUT:
|
| 861 | 3
|
| 862 | -3
|
| 863 | -3
|
| 864 | 3
|
| 865 | ---
|
| 866 | 6
|
| 867 | -6
|
| 868 | -6
|
| 869 | 6
|
| 870 | ## END
|
| 871 |
|
| 872 | #### Negative numbers with %
|
| 873 |
|
| 874 | echo $(( 10 % 3))
|
| 875 | echo $((-10 % 3))
|
| 876 | echo $(( 10 % -3))
|
| 877 | echo $((-10 % -3))
|
| 878 |
|
| 879 | ## STDOUT:
|
| 880 | 1
|
| 881 | -1
|
| 882 | 1
|
| 883 | -1
|
| 884 | ## END
|
| 885 |
|
| 886 | #### Negative numbers with bit shift
|
| 887 |
|
| 888 | echo $(( 5 << 1 ))
|
| 889 | echo $(( 5 << 0 ))
|
| 890 | $SH -c 'echo $(( 5 << -1 ))' # implementation defined - OSH fails
|
| 891 | echo ---
|
| 892 |
|
| 893 | echo $(( 16 >> 1 ))
|
| 894 | echo $(( 16 >> 0 ))
|
| 895 | $SH -c 'echo $(( 16 >> -1 ))' # not sure why this is zero
|
| 896 | $SH -c 'echo $(( 16 >> -2 ))' # also 0
|
| 897 | echo ---
|
| 898 |
|
| 899 | ## STDOUT:
|
| 900 | 10
|
| 901 | 5
|
| 902 | ---
|
| 903 | 8
|
| 904 | 16
|
| 905 | ---
|
| 906 | ## END
|
| 907 |
|
| 908 | ## OK bash/dash/zsh STDOUT:
|
| 909 | 10
|
| 910 | 5
|
| 911 | -9223372036854775808
|
| 912 | ---
|
| 913 | 8
|
| 914 | 16
|
| 915 | 0
|
| 916 | 0
|
| 917 | ---
|
| 918 | ## END
|
| 919 |
|
| 920 | ## BUG mksh STDOUT:
|
| 921 | 10
|
| 922 | 5
|
| 923 | -2147483648
|
| 924 | ---
|
| 925 | 8
|
| 926 | 16
|
| 927 | 0
|
| 928 | 0
|
| 929 | ---
|
| 930 | ## END
|
| 931 |
|
| 932 | #### undef[0]
|
| 933 | case $SH in dash) exit ;; esac
|
| 934 |
|
| 935 | echo ARITH $(( undef[0] ))
|
| 936 | echo status=$?
|
| 937 | echo
|
| 938 |
|
| 939 | (( undef[0] ))
|
| 940 | echo status=$?
|
| 941 | echo
|
| 942 |
|
| 943 | echo UNDEF ${undef[0]}
|
| 944 | echo status=$?
|
| 945 |
|
| 946 | ## STDOUT:
|
| 947 | ARITH 0
|
| 948 | status=0
|
| 949 |
|
| 950 | status=1
|
| 951 |
|
| 952 | UNDEF
|
| 953 | status=0
|
| 954 | ## END
|
| 955 | ## N-I dash STDOUT:
|
| 956 | ## END
|
| 957 |
|
| 958 | #### undef[0] with nounset
|
| 959 | case $SH in dash) exit ;; esac
|
| 960 |
|
| 961 | set -o nounset
|
| 962 | echo UNSET $(( undef[0] ))
|
| 963 | echo status=$?
|
| 964 |
|
| 965 | ## status: 1
|
| 966 | ## STDOUT:
|
| 967 | ## END
|
| 968 |
|
| 969 | ## N-I dash status: 0
|
| 970 |
|
| 971 | ## BUG mksh/zsh status: 0
|
| 972 | ## BUG mksh/zsh STDOUT:
|
| 973 | UNSET 0
|
| 974 | status=0
|
| 975 | ## END
|
| 976 |
|
| 977 | ## N-I dash STDOUT:
|
| 978 | ## END
|
| 979 |
|
| 980 | #### s[0] with string abc
|
| 981 | case $SH in dash) exit ;; esac
|
| 982 |
|
| 983 | s='abc'
|
| 984 | echo abc $(( s[0] )) $(( s[1] ))
|
| 985 | echo status=$?
|
| 986 | echo
|
| 987 |
|
| 988 | (( s[0] ))
|
| 989 | echo status=$?
|
| 990 | echo
|
| 991 |
|
| 992 | ## STDOUT:
|
| 993 | abc 0 0
|
| 994 | status=0
|
| 995 |
|
| 996 | status=1
|
| 997 |
|
| 998 | ## END
|
| 999 | ## N-I dash STDOUT:
|
| 1000 | ## END
|
| 1001 |
|
| 1002 | #### s[0] with string 42
|
| 1003 | case $SH in dash) exit ;; esac
|
| 1004 |
|
| 1005 | s='42'
|
| 1006 | echo 42 $(( s[0] )) $(( s[1] ))
|
| 1007 | echo status=$?
|
| 1008 |
|
| 1009 | ## STDOUT:
|
| 1010 | 42 42 0
|
| 1011 | status=0
|
| 1012 | ## END
|
| 1013 | ## N-I dash STDOUT:
|
| 1014 | ## END
|
| 1015 |
|
| 1016 | ## BUG zsh STDOUT:
|
| 1017 | 42 0 4
|
| 1018 | status=0
|
| 1019 | ## END
|
| 1020 |
|
| 1021 | #### s[0] with string '12 34'
|
| 1022 |
|
| 1023 | s='12 34'
|
| 1024 | echo '12 34' $(( s[0] )) $(( s[1] ))
|
| 1025 | echo status=$?
|
| 1026 |
|
| 1027 | ## status: 1
|
| 1028 | ## STDOUT:
|
| 1029 | ## END
|
| 1030 |
|
| 1031 | ## OK dash status: 2
|
| 1032 |
|
| 1033 | ## BUG zsh status: 0
|
| 1034 | ## BUG zsh STDOUT:
|
| 1035 | 12 34 0 1
|
| 1036 | status=0
|
| 1037 | ## END
|
| 1038 |
|
| 1039 | # bash prints an error, but doesn't fail
|
| 1040 |
|
| 1041 | ## BUG bash status: 0
|
| 1042 | ## BUG bash STDOUT:
|
| 1043 | status=1
|
| 1044 | ## END
|