| 1 | ## compare_shells: dash bash mksh zsh
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| 2 |
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| 3 | # Some shell errors are unrecoverable! Like divide by zero (except in bash.
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| 4 | #
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| 5 | # Any others?
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| 6 |
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| 7 |
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| 8 | #### Unrecoverable: divide by zero in redirect word
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| 9 |
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| 10 | $SH -c '
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| 11 | echo hi > file$(( 42 / 0 )) in
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| 12 | echo inside=$?
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| 13 | '
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| 14 | echo outside=$?
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| 15 |
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| 16 | ## STDOUT:
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| 17 | outside=1
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| 18 | ## END
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| 19 |
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| 20 | ## OK dash/ash STDOUT:
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| 21 | outside=2
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| 22 | ## END
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| 23 |
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| 24 | # bash makes the command fail
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| 25 | ## OK bash STDOUT:
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| 26 | inside=1
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| 27 | outside=0
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| 28 | ## END:
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| 29 |
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| 30 |
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| 31 | #### Unrecoverable: divide by zero in conditional word
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| 32 |
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| 33 | $SH -c '
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| 34 | if test foo$(( 42 / 0 )) = foo; then
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| 35 | echo true
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| 36 | else
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| 37 | echo false
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| 38 | fi
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| 39 | echo inside=$?
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| 40 | '
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| 41 | echo outside=$?
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| 42 |
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| 43 | echo ---
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| 44 |
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| 45 | $SH -c '
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| 46 | if test foo$(( 42 / 0 )) = foo; then
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| 47 | echo true
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| 48 | fi
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| 49 | echo inside=$?
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| 50 | '
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| 51 | echo outside=$?
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| 52 |
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| 53 | ## STDOUT:
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| 54 | outside=1
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| 55 | ---
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| 56 | outside=1
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| 57 | ## END
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| 58 |
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| 59 | ## OK dash/ash STDOUT:
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| 60 | outside=2
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| 61 | ---
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| 62 | outside=2
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| 63 | ## END
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| 64 |
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| 65 | # bash makes the command fail
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| 66 | ## OK bash STDOUT:
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| 67 | inside=1
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| 68 | outside=0
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| 69 | ---
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| 70 | inside=1
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| 71 | outside=0
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| 72 | ## END:
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| 73 |
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| 74 | # weird difference in zsh!
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| 75 |
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| 76 | ## BUG zsh STDOUT:
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| 77 | outside=1
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| 78 | ---
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| 79 | outside=0
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| 80 | ## END
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| 81 |
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| 82 |
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| 83 | #### Unrecoverable: divide by zero in case
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| 84 |
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| 85 | $SH -c '
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| 86 | case $(( 42 / 0 )) in
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| 87 | (*) echo hi ;;
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| 88 | esac
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| 89 | echo inside=$?
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| 90 | '
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| 91 | echo outside=$?
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| 92 |
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| 93 | echo ---
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| 94 |
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| 95 | $SH -c '
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| 96 | case foo in
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| 97 | ( $(( 42 / 0 )) )
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| 98 | echo hi
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| 99 | ;;
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| 100 | esac
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| 101 | echo inside=$?
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| 102 | '
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| 103 | echo outside=$?
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| 104 |
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| 105 | ## STDOUT:
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| 106 | outside=1
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| 107 | ---
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| 108 | outside=1
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| 109 | ## END
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| 110 |
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| 111 | ## OK dash/ash STDOUT:
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| 112 | outside=2
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| 113 | ---
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| 114 | outside=2
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| 115 | ## END
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| 116 |
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| 117 | ## OK bash STDOUT:
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| 118 | inside=1
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| 119 | outside=0
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| 120 | ---
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| 121 | inside=1
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| 122 | outside=0
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| 123 | ## END:
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| 124 |
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| 125 | ## BUG zsh STDOUT:
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| 126 | outside=0
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| 127 | ---
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| 128 | outside=0
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| 129 | ## END
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| 130 |
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| 131 |
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| 132 | #### Unrecoverable: ${undef?message}
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| 133 |
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| 134 | $SH -c '
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| 135 | echo ${undef?message}
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| 136 | echo inside=$?
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| 137 | '
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| 138 | echo outside=$?
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| 139 |
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| 140 | $SH -c '
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| 141 | case ${undef?message} in
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| 142 | (*) echo hi ;;
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| 143 | esac
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| 144 | echo inside=$?
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| 145 | '
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| 146 | echo outside=$?
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| 147 |
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| 148 | ## STDOUT:
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| 149 | outside=1
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| 150 | outside=1
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| 151 | ## END
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| 152 | ## OK dash STDOUT:
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| 153 | outside=2
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| 154 | outside=2
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| 155 | ## END
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| 156 | ## OK bash STDOUT:
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| 157 | outside=127
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| 158 | outside=127
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| 159 | ## END
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| 160 |
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| 161 | #### ${undef} with nounset
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| 162 |
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| 163 | $SH -c '
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| 164 | set -o nounset
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| 165 | case ${undef} in
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| 166 | (*) echo hi ;;
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| 167 | esac
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| 168 | echo inside=$?
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| 169 | '
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| 170 | echo outside=$?
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| 171 |
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| 172 | ## STDOUT:
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| 173 | outside=1
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| 174 | ## END
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| 175 |
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| 176 | ## OK dash STDOUT:
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| 177 | outside=2
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| 178 | ## END
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| 179 |
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| 180 | ## OK bash STDOUT:
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| 181 | outside=127
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| 182 | ## END
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| 183 |
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| 184 | ## BUG zsh STDOUT:
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| 185 | outside=0
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| 186 | ## END
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| 187 |
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