| 1 | ## compare_shells: bash-4.4 mksh zsh
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| 2 |
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| 3 | #### (( )) result
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| 4 | (( 1 )) && echo True
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| 5 | (( 0 )) || echo False
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| 6 | ## stdout-json: "True\nFalse\n"
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| 7 |
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| 8 | #### negative number is true
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| 9 | (( -1 )) && echo True
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| 10 | ## stdout: True
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| 11 |
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| 12 | #### (( )) in if statement
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| 13 | if (( 3 > 2)); then
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| 14 | echo True
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| 15 | fi
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| 16 | ## stdout: True
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| 17 |
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| 18 | #### (( ))
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| 19 | # What is the difference with this and let? One difference: spaces are allowed.
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| 20 | (( x = 1 ))
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| 21 | (( y = x + 2 ))
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| 22 | echo $x $y
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| 23 | ## stdout: 1 3
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| 24 |
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| 25 | #### (( )) with arrays
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| 26 | a=(4 5 6)
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| 27 | (( sum = a[0] + a[1] + a[2] ))
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| 28 | echo $sum
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| 29 | ## stdout: 15
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| 30 | ## OK zsh stdout: 9
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| 31 |
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| 32 | #### (( )) with error
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| 33 | (( a = 0 )) || echo false
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| 34 | (( b = 1 )) && echo true
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| 35 | (( c = -1 )) && echo true
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| 36 | echo $((a + b + c))
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| 37 | ## STDOUT:
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| 38 | false
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| 39 | true
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| 40 | true
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| 41 | 0
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| 42 | ## END
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| 43 |
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| 44 |
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| 45 | #### bash and mksh: V in (( a[K] = V )) gets coerced to integer
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| 46 | shopt -u strict_arith || true
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| 47 | K=key
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| 48 | V=value
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| 49 | typeset -a a
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| 50 | (( a[K] = V ))
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| 51 |
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| 52 | # not there!
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| 53 | echo a[\"key\"]=${a[$K]}
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| 54 |
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| 55 | echo keys = ${!a[@]}
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| 56 | echo values = ${a[@]}
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| 57 | ## STDOUT:
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| 58 | a["key"]=0
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| 59 | keys = 0
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| 60 | values = 0
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| 61 | ## END
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| 62 | ## N-I zsh status: 1
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| 63 | ## N-I zsh stdout-json: ""
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| 64 |
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| 65 | #### bash: K in (( A[K] = V )) is a constant string
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| 66 | K=5
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| 67 | V=42
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| 68 | typeset -A A
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| 69 | (( A[K] = V ))
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| 70 |
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| 71 | echo A["5"]=${A["5"]}
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| 72 | echo keys = ${!A[@]}
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| 73 | echo values = ${A[@]}
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| 74 | ## STDOUT:
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| 75 | A[5]=
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| 76 | keys = K
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| 77 | values = 42
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| 78 | ## END
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| 79 | ## OK osh status: 1
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| 80 | ## OK osh stdout-json: ""
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| 81 | ## N-I zsh status: 1
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| 82 | ## N-I zsh stdout-json: ""
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| 83 | ## N-I mksh status: 1
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| 84 | ## N-I mksh stdout-json: ""
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| 85 |
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| 86 | #### BUG: (( V = A[K] )) doesn't retrieve the right value
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| 87 | typeset -A A
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| 88 | K=5
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| 89 | V=42
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| 90 | A["$K"]=$V
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| 91 | A["K"]=oops
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| 92 | A[K]=oops2
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| 93 |
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| 94 | # We don't neither 42 nor "oops". Bad!
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| 95 | (( V = A[K] ))
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| 96 |
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| 97 | echo V=$V
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| 98 | ## status: 1
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| 99 | ## stdout-json: ""
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| 100 | ## BUG bash/zsh status: 0
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| 101 | ## BUG bash/zsh STDOUT:
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| 102 | V=0
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| 103 | ## END
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| 104 |
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| 105 | #### bash: V in (( A["K"] = V )) gets coerced to integer
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| 106 | shopt -u strict_arith || true
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| 107 | K=key
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| 108 | V=value
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| 109 | typeset -A A || exit 1
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| 110 | (( A["K"] = V ))
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| 111 |
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| 112 | # not there!
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| 113 | echo A[\"key\"]=${A[$K]}
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| 114 |
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| 115 | echo keys = ${!A[@]}
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| 116 | echo values = ${A[@]}
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| 117 | ## STDOUT:
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| 118 | A["key"]=
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| 119 | keys = K
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| 120 | values = 0
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| 121 | ## END
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| 122 | ## N-I zsh stdout-json: ""
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| 123 | ## N-I zsh status: 1
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| 124 | ## N-I mksh stdout-json: ""
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| 125 | ## N-I mksh status: 1
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| 126 |
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| 127 | #### literal strings inside (( ))
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| 128 | declare -A A
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| 129 | A['x']=42
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| 130 | (( x = A['x'] ))
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| 131 | (( A['y'] = 'y' )) # y is a variable, gets coerced to 0
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| 132 | echo $x ${A['y']}
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| 133 | ## STDOUT:
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| 134 | 42 0
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| 135 | ## END
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| 136 | ## BUG mksh status: 0
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| 137 | ## N-I mksh STDOUT:
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| 138 | 0
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| 139 | ## END
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| 140 | ## BUG zsh status: 0
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| 141 | ## N-I zsh STDOUT:
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| 142 | 42
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| 143 | ## END
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| 144 |
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| 145 | #### (( )) with redirect
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| 146 | (( a = $(stdout_stderr.py 42) + 10 )) 2>$TMP/x.txt
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| 147 | echo $a
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| 148 | echo --
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| 149 | cat $TMP/x.txt
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| 150 | ## STDOUT:
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| 151 | 52
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| 152 | --
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| 153 | STDERR
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| 154 | ## END
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| 155 |
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| 156 | #### Assigning whole raray (( b = a ))
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| 157 | a=(4 5 6)
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| 158 | (( b = a ))
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| 159 |
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| 160 | echo "${a[@]}"
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| 161 |
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| 162 | # OSH doesn't like this
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| 163 | echo "${b[@]}"
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| 164 |
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| 165 | ## status: 0
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| 166 | ## STDOUT:
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| 167 | 4 5 6
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| 168 | 4
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| 169 | ## END
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| 170 | ## BUG zsh status: 0
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| 171 | ## BUG zsh STDOUT:
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| 172 | 4 5 6
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| 173 |
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| 174 | ## END
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| 175 |
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| 176 | #### set associative array
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| 177 | declare -A A=(['foo']=bar ['spam']=42)
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| 178 | (( x = A['spam'] ))
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| 179 | echo $x
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| 180 | ## STDOUT:
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| 181 | 42
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| 182 | ## END
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| 183 | ## N-I mksh status: 1
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| 184 | ## N-I mksh stdout-json: ""
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| 185 | ## N-I zsh STDOUT:
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| 186 | 0
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| 187 | ## END
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| 188 |
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| 189 | #### Example of incrementing associative array entry with var key (ble.sh)
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| 190 | declare -A A=(['foo']=42)
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| 191 | key='foo'
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| 192 |
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| 193 | # note: in bash, (( A[\$key] += 1 )) works the same way.
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| 194 |
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| 195 | set -- 1 2
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| 196 | (( A[$key] += $2 ))
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| 197 |
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| 198 | echo foo=${A['foo']}
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| 199 |
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| 200 | ## STDOUT:
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| 201 | foo=44
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| 202 | ## END
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| 203 | ## N-I mksh/zsh status: 1
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| 204 | ## N-I mksh/zsh stdout-json: ""
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| 205 |
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