| 1 | ## compare_shells: bash dash mksh zsh
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| 2 |
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| 3 | #### Lazy Evaluation of Alternative
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| 4 | i=0
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| 5 | x=x
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| 6 | echo ${x:-$((i++))}
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| 7 | echo $i
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| 8 | echo ${undefined:-$((i++))}
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| 9 | echo $i # i is one because the alternative was only evaluated once
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| 10 | ## status: 0
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| 11 | ## stdout-json: "x\n0\n0\n1\n"
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| 12 | ## N-I dash status: 2
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| 13 | ## N-I dash stdout-json: "x\n0\n"
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| 14 |
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| 15 | #### Default value when empty
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| 16 | empty=''
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| 17 | echo ${empty:-is empty}
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| 18 | ## stdout: is empty
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| 19 |
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| 20 | #### Default value when unset
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| 21 | echo ${unset-is unset}
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| 22 | ## stdout: is unset
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| 23 |
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| 24 | #### Unquoted with array as default value
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| 25 | set -- '1 2' '3 4'
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| 26 | argv.py X${unset=x"$@"x}X
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| 27 | argv.py X${unset=x$@x}X # If you want OSH to split, write this
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| 28 | # osh
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| 29 | ## STDOUT:
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| 30 | ['Xx1', '2', '3', '4xX']
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| 31 | ['Xx1', '2', '3', '4xX']
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| 32 | ## END
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| 33 | ## OK osh STDOUT:
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| 34 | ['Xx1 2', '3 4xX']
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| 35 | ['Xx1', '2', '3', '4xX']
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| 36 | ## END
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| 37 | ## OK zsh STDOUT:
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| 38 | ['Xx1 2 3 4xX']
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| 39 | ['Xx1 2 3 4xX']
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| 40 | ## END
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| 41 |
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| 42 | #### Quoted with array as default value
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| 43 | set -- '1 2' '3 4'
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| 44 | argv.py "X${unset=x"$@"x}X"
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| 45 | argv.py "X${unset=x$@x}X" # OSH is the same here
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| 46 | ## STDOUT:
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| 47 | ['Xx1 2 3 4xX']
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| 48 | ['Xx1 2 3 4xX']
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| 49 | ## END
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| 50 |
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| 51 | # Bash 4.2..4.4 had a bug. This was fixed in Bash 5.0.
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| 52 | #
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| 53 | # ## BUG bash STDOUT:
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| 54 | # ['Xx1', '2', '3', '4xX']
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| 55 | # ['Xx1 2 3 4xX']
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| 56 | # ## END
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| 57 |
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| 58 | ## OK osh STDOUT:
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| 59 | ['Xx1 2', '3 4xX']
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| 60 | ['Xx1 2 3 4xX']
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| 61 | ## END
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| 62 |
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| 63 | #### Assign default with array
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| 64 | set -- '1 2' '3 4'
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| 65 | argv.py X${unset=x"$@"x}X
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| 66 | argv.py "$unset"
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| 67 | ## STDOUT:
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| 68 | ['Xx1', '2', '3', '4xX']
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| 69 | ['x1 2 3 4x']
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| 70 | ## END
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| 71 | ## OK osh STDOUT:
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| 72 | ['Xx1 2', '3 4xX']
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| 73 | ['x1 2 3 4x']
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| 74 | ## END
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| 75 | ## OK zsh STDOUT:
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| 76 | ['Xx1 2 3 4xX']
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| 77 | ['x1 2 3 4x']
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| 78 | ## END
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| 79 |
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| 80 | #### Assign default value when empty
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| 81 | empty=''
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| 82 | ${empty:=is empty}
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| 83 | echo $empty
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| 84 | ## stdout: is empty
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| 85 |
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| 86 | #### Assign default value when unset
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| 87 | ${unset=is unset}
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| 88 | echo $unset
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| 89 | ## stdout: is unset
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| 90 |
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| 91 | #### ${v:+foo} Alternative value when empty
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| 92 | v=foo
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| 93 | empty=''
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| 94 | echo ${v:+v is not empty} ${empty:+is not empty}
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| 95 | ## stdout: v is not empty
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| 96 |
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| 97 | #### ${v+foo} Alternative value when unset
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| 98 | v=foo
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| 99 | echo ${v+v is not unset} ${unset:+is not unset}
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| 100 | ## stdout: v is not unset
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| 101 |
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| 102 | #### "${x+foo}" quoted (regression)
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| 103 | # Python's configure caught this
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| 104 | argv.py "${with_icc+set}" = set
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| 105 | ## STDOUT:
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| 106 | ['', '=', 'set']
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| 107 | ## END
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| 108 |
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| 109 | #### ${s+foo} and ${s:+foo} when set -u
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| 110 | set -u
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| 111 | v=v
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| 112 | echo v=${v:+foo}
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| 113 | echo v=${v+foo}
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| 114 | unset v
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| 115 | echo v=${v:+foo}
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| 116 | echo v=${v+foo}
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| 117 | ## STDOUT:
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| 118 | v=foo
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| 119 | v=foo
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| 120 | v=
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| 121 | v=
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| 122 | ## END
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| 123 |
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| 124 | #### "${array[@]} with set -u (bash is outlier)
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| 125 | case $SH in dash) exit ;; esac
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| 126 |
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| 127 | set -u
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| 128 |
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| 129 | typeset -a empty
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| 130 | empty=()
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| 131 |
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| 132 | echo empty /"${empty[@]}"/
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| 133 | echo undefined /"${undefined[@]}"/
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| 134 |
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| 135 | ## status: 1
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| 136 | ## STDOUT:
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| 137 | empty //
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| 138 | ## END
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| 139 |
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| 140 | ## BUG bash status: 0
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| 141 | ## BUG bash STDOUT:
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| 142 | empty //
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| 143 | undefined //
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| 144 | ## END
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| 145 |
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| 146 | # empty array is unset in mksh
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| 147 | ## BUG mksh status: 1
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| 148 | ## BUG mksh STDOUT:
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| 149 | ## END
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| 150 |
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| 151 | ## N-I dash status: 0
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| 152 | ## N-I dash STDOUT:
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| 153 | ## END
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| 154 |
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| 155 |
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| 156 | #### "${undefined[@]+foo}" and "${undefined[@]:+foo}", with set -u
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| 157 | case $SH in dash) exit ;; esac
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| 158 |
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| 159 | set -u
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| 160 |
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| 161 | echo plus /"${array[@]+foo}"/
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| 162 | echo plus colon /"${array[@]:+foo}"/
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| 163 |
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| 164 | ## STDOUT:
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| 165 | plus //
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| 166 | plus colon //
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| 167 | ## END
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| 168 |
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| 169 | ## N-I dash STDOUT:
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| 170 | ## END
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| 171 |
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| 172 | #### "${a[@]+foo}" and "${a[@]:+foo}" - operators are equivalent on arrays?
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| 173 |
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| 174 | case $SH in dash) exit ;; esac
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| 175 |
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| 176 | echo '+ ' /"${array[@]+foo}"/
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| 177 | echo '+:' /"${array[@]:+foo}"/
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| 178 | echo
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| 179 |
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| 180 | typeset -a array
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| 181 | array=()
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| 182 |
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| 183 | echo '+ ' /"${array[@]+foo}"/
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| 184 | echo '+:' /"${array[@]:+foo}"/
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| 185 | echo
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| 186 |
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| 187 | array=('')
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| 188 |
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| 189 | echo '+ ' /"${array[@]+foo}"/
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| 190 | echo '+:' /"${array[@]:+foo}"/
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| 191 | echo
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| 192 |
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| 193 | array=(spam eggs)
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| 194 |
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| 195 | echo '+ ' /"${array[@]+foo}"/
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| 196 | echo '+:' /"${array[@]:+foo}"/
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| 197 | echo
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| 198 |
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| 199 |
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| 200 | ## BUG mksh STDOUT:
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| 201 | + //
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| 202 | +: //
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| 203 |
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| 204 | + //
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| 205 | +: //
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| 206 |
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| 207 | + /foo/
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| 208 | +: //
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| 209 |
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| 210 | + /foo/
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| 211 | +: /foo/
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| 212 |
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| 213 | ## END
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| 214 |
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| 215 | # Bash 2.0..4.4 has a bug that "${a[@]:-xxx}" produces an empty string. It
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| 216 | # seemed to consider a[@] and a[*] are non-empty when there is at least one
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| 217 | # element even if the element is empty. This was fixed in Bash 5.0.
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| 218 | #
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| 219 | # ## BUG bash STDOUT:
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| 220 | # + //
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| 221 | # +: //
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| 222 | #
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| 223 | # + //
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| 224 | # +: //
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| 225 | #
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| 226 | # + /foo/
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| 227 | # +: /foo/
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| 228 | #
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| 229 | # + /foo/
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| 230 | # +: /foo/
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| 231 | #
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| 232 | # ## END
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| 233 |
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| 234 | ## BUG zsh STDOUT:
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| 235 | + //
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| 236 | +: //
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| 237 |
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| 238 | + /foo/
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| 239 | +: //
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| 240 |
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| 241 | + /foo/
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| 242 | +: /foo/
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| 243 |
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| 244 | + /foo/
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| 245 | +: /foo/
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| 246 |
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| 247 | ## END
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| 248 |
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| 249 | ## N-I dash STDOUT:
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| 250 | ## END
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| 251 |
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| 252 |
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| 253 |
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| 254 | #### Nix idiom ${!hooksSlice+"${!hooksSlice}"} - was workaround for obsolete bash 4.3 bug
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| 255 |
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| 256 | case $SH in dash|mksh|zsh) exit ;; esac
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| 257 |
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| 258 | # https://oilshell.zulipchat.com/#narrow/stream/307442-nix/topic/Replacing.20bash.20with.20osh.20in.20Nixpkgs.20stdenv
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| 259 |
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| 260 | (argv.py ${!hooksSlice+"${!hooksSlice}"})
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| 261 |
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| 262 | hooksSlice=x
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| 263 |
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| 264 | argv.py ${!hooksSlice+"${!hooksSlice}"}
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| 265 |
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| 266 | declare -a hookSlice=()
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| 267 |
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| 268 | argv.py ${!hooksSlice+"${!hooksSlice}"}
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| 269 |
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| 270 | foo=42
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| 271 | bar=43
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| 272 |
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| 273 | declare -a hooksSlice=(foo bar spam eggs)
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| 274 |
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| 275 | argv.py ${!hooksSlice+"${!hooksSlice}"}
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| 276 |
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| 277 | ## STDOUT:
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| 278 | []
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| 279 | []
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| 280 | ['42']
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| 281 | ## END
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| 282 |
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| 283 | # Bash 4.4 has a bug that ${!undef-} successfully generates an empty word.
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| 284 | #
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| 285 | # ## BUG bash STDOUT:
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| 286 | # []
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| 287 | # []
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| 288 | # []
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| 289 | # ['42']
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| 290 | # ## END
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| 291 |
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| 292 | ## OK dash/mksh/zsh STDOUT:
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| 293 | ## END
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| 294 |
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| 295 | #### ${v-foo} and ${v:-foo} when set -u
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| 296 | set -u
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| 297 | v=v
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| 298 | echo v=${v:-foo}
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| 299 | echo v=${v-foo}
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| 300 | unset v
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| 301 | echo v=${v:-foo}
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| 302 | echo v=${v-foo}
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| 303 | ## STDOUT:
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| 304 | v=v
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| 305 | v=v
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| 306 | v=foo
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| 307 | v=foo
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| 308 | ## END
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| 309 |
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| 310 | #### array and - and +
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| 311 | case $SH in (dash) exit ;; esac
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| 312 |
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| 313 | shopt -s compat_array # to refer to array as scalar
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| 314 |
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| 315 | empty=()
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| 316 | a1=('')
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| 317 | a2=('' x)
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| 318 | a3=(3 4)
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| 319 | echo empty=${empty[@]-minus}
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| 320 | echo a1=${a1[@]-minus}
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| 321 | echo a1[0]=${a1[0]-minus}
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| 322 | echo a2=${a2[@]-minus}
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| 323 | echo a3=${a3[@]-minus}
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| 324 | echo ---
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| 325 |
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| 326 | echo empty=${empty[@]+plus}
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| 327 | echo a1=${a1[@]+plus}
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| 328 | echo a1[0]=${a1[0]+plus}
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| 329 | echo a2=${a2[@]+plus}
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| 330 | echo a3=${a3[@]+plus}
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| 331 | echo ---
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| 332 |
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| 333 | echo empty=${empty+plus}
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| 334 | echo a1=${a1+plus}
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| 335 | echo a2=${a2+plus}
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| 336 | echo a3=${a3+plus}
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| 337 | echo ---
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| 338 |
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| 339 | # Test quoted arrays too
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| 340 | argv.py "${empty[@]-minus}"
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| 341 | argv.py "${empty[@]+plus}"
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| 342 | argv.py "${a1[@]-minus}"
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| 343 | argv.py "${a1[@]+plus}"
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| 344 | argv.py "${a1[0]-minus}"
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| 345 | argv.py "${a1[0]+plus}"
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| 346 | argv.py "${a2[@]-minus}"
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| 347 | argv.py "${a2[@]+plus}"
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| 348 | argv.py "${a3[@]-minus}"
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| 349 | argv.py "${a3[@]+plus}"
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| 350 |
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| 351 | ## STDOUT:
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| 352 | empty=minus
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| 353 | a1=
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| 354 | a1[0]=
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| 355 | a2= x
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| 356 | a3=3 4
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| 357 | ---
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| 358 | empty=
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| 359 | a1=plus
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| 360 | a1[0]=plus
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| 361 | a2=plus
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| 362 | a3=plus
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| 363 | ---
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| 364 | empty=
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| 365 | a1=plus
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| 366 | a2=plus
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| 367 | a3=plus
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| 368 | ---
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| 369 | ['minus']
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| 370 | []
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| 371 | ['']
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| 372 | ['plus']
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| 373 | ['']
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| 374 | ['plus']
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| 375 | ['', 'x']
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| 376 | ['plus']
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| 377 | ['3', '4']
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| 378 | ['plus']
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| 379 | ## END
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| 380 | ## N-I dash stdout-json: ""
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| 381 | ## N-I zsh stdout-json: "empty=\na1=\n"
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| 382 | ## N-I zsh status: 1
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| 383 |
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| 384 | #### $@ and - and +
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| 385 | echo argv=${@-minus}
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| 386 | echo argv=${@+plus}
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| 387 | echo argv=${@:-minus}
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| 388 | echo argv=${@:+plus}
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| 389 | ## STDOUT:
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| 390 | argv=minus
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| 391 | argv=
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| 392 | argv=minus
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| 393 | argv=
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| 394 | ## END
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| 395 | ## BUG dash/zsh STDOUT:
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| 396 | argv=
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| 397 | argv=plus
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| 398 | argv=minus
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| 399 | argv=
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| 400 | ## END
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| 401 |
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| 402 | #### assoc array and - and +
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| 403 | case $SH in (dash|mksh) exit ;; esac
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| 404 |
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| 405 | declare -A empty=()
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| 406 | declare -A assoc=(['k']=v)
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| 407 |
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| 408 | echo empty=${empty[@]-minus}
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| 409 | echo empty=${empty[@]+plus}
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| 410 | echo assoc=${assoc[@]-minus}
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| 411 | echo assoc=${assoc[@]+plus}
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| 412 |
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| 413 | echo ---
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| 414 | echo empty=${empty[@]:-minus}
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| 415 | echo empty=${empty[@]:+plus}
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| 416 | echo assoc=${assoc[@]:-minus}
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| 417 | echo assoc=${assoc[@]:+plus}
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| 418 | ## STDOUT:
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| 419 | empty=minus
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| 420 | empty=
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| 421 | assoc=v
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| 422 | assoc=plus
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| 423 | ---
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| 424 | empty=minus
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| 425 | empty=
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| 426 | assoc=v
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| 427 | assoc=plus
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| 428 | ## END
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| 429 |
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| 430 | ## BUG zsh STDOUT:
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| 431 | empty=
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| 432 | empty=plus
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| 433 | assoc=minus
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| 434 | assoc=
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| 435 | ---
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| 436 | empty=minus
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| 437 | empty=
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| 438 | assoc=minus
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| 439 | assoc=
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| 440 | ## END
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| 441 |
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| 442 | ## N-I dash/mksh STDOUT:
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| 443 | ## END
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| 444 |
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| 445 |
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| 446 | #### Error when empty
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| 447 | empty=''
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| 448 | echo ${empty:?'is em'pty} # test eval of error
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| 449 | echo should not get here
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| 450 | ## stdout-json: ""
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| 451 | ## status: 1
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| 452 | ## OK dash status: 2
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| 453 |
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| 454 | #### Error when unset
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| 455 | echo ${unset?is empty}
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| 456 | echo should not get here
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| 457 | ## stdout-json: ""
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| 458 | ## status: 1
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| 459 | ## OK dash status: 2
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| 460 |
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| 461 | #### Error when unset
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| 462 | v=foo
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| 463 | echo ${v+v is not unset} ${unset:+is not unset}
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| 464 | ## stdout: v is not unset
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| 465 |
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| 466 | #### ${var=x} dynamic scope
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| 467 | f() { : "${hello:=x}"; echo $hello; }
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| 468 | f
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| 469 | echo hello=$hello
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| 470 |
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| 471 | f() { hello=x; }
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| 472 | f
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| 473 | echo hello=$hello
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| 474 | ## STDOUT:
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| 475 | x
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| 476 | hello=x
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| 477 | hello=x
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| 478 | ## END
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| 479 |
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| 480 | #### array ${arr[0]=x}
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| 481 | arr=()
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| 482 | echo ${#arr[@]}
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| 483 | : ${arr[0]=x}
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| 484 | echo ${#arr[@]}
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| 485 | ## STDOUT:
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| 486 | 0
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| 487 | 1
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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 zsh status: 1
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| 492 | ## N-I zsh stdout-json: "0\n"
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| 493 |
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| 494 | #### assoc array ${arr["k"]=x}
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| 495 | # note: this also works in zsh
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| 496 |
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| 497 | declare -A arr=()
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| 498 | echo ${#arr[@]}
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| 499 | : ${arr['k']=x}
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| 500 | echo ${#arr[@]}
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| 501 | ## STDOUT:
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| 502 | 0
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| 503 | 1
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| 504 | ## END
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| 505 | ## N-I dash status: 2
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| 506 | ## N-I dash stdout-json: ""
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| 507 | ## N-I mksh status: 1
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| 508 | ## N-I mksh stdout-json: ""
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| 509 |
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| 510 | #### "\z" as arg
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| 511 | echo "${undef-\$}"
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| 512 | echo "${undef-\(}"
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| 513 | echo "${undef-\z}"
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| 514 | echo "${undef-\"}"
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| 515 | echo "${undef-\`}"
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| 516 | echo "${undef-\\}"
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| 517 | ## STDOUT:
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| 518 | $
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| 519 | \(
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| 520 | \z
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| 521 | "
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| 522 | `
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| 523 | \
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| 524 | ## END
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| 525 | ## BUG yash STDOUT:
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| 526 | $
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| 527 | (
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| 528 | z
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| 529 | "
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| 530 | `
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| 531 | \
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| 532 | ## END
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| 533 | # Note: this line terminates the quoting by ` not to confuse the text editor.
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| 534 |
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| 535 |
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| 536 | #### "\e" as arg
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| 537 | echo "${undef-\e}"
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| 538 | ## STDOUT:
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| 539 | \e
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| 540 | ## END
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| 541 | ## BUG zsh/mksh stdout-repr: '\x1b\n'
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| 542 | ## BUG yash stdout: e
|