| 1 | ## oils_failures_allowed: 3
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| 2 | ## compare_shells: bash dash mksh zsh ash
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| 3 |
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| 4 |
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| 5 | # POSIX rule about special builtins pointed at:
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| 6 | #
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| 7 | # https://www.reddit.com/r/oilshell/comments/5ykpi3/oildev_is_alive/
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| 8 |
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| 9 | #### : is special and prefix assignments persist after special builtins (set -o posix)
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| 10 | case $SH in
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| 11 | dash|zsh)
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| 12 | ;;
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| 13 | *)
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| 14 | # for bash
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| 15 | set -o posix
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| 16 | ;;
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| 17 | esac
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| 18 |
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| 19 | foo=bar :
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| 20 | echo foo=$foo
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| 21 |
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| 22 | # Not true when you use 'builtin'
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| 23 | z=Z builtin :
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| 24 | echo z=$Z
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| 25 |
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| 26 | ## STDOUT:
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| 27 | foo=bar
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| 28 | z=
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| 29 | ## END
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| 30 |
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| 31 | ## BUG zsh STDOUT:
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| 32 | foo=
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| 33 | z=
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| 34 | ## END
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| 35 |
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| 36 | #### readonly is special and prefix assignments persist (set -o posix)
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| 37 |
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| 38 | # Bash only implements it behind the posix option
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| 39 | case $SH in
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| 40 | dash|zsh)
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| 41 | ;;
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| 42 | *)
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| 43 | # for bash
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| 44 | set -o posix
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| 45 | ;;
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| 46 | esac
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| 47 | foo=bar readonly spam=eggs
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| 48 | echo foo=$foo
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| 49 | echo spam=$spam
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| 50 |
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| 51 | # should NOT be exported
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| 52 | printenv.py foo
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| 53 | printenv.py spam
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| 54 |
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| 55 | ## STDOUT:
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| 56 | foo=bar
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| 57 | spam=eggs
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| 58 | None
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| 59 | None
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| 60 | ## END
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| 61 |
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| 62 | ## OK bash/osh STDOUT:
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| 63 | foo=bar
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| 64 | spam=eggs
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| 65 | bar
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| 66 | None
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| 67 | ## END
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| 68 |
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| 69 | #### true is not special
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| 70 | foo=bar true
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| 71 | echo $foo
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| 72 | ## stdout:
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| 73 |
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| 74 | #### Shift is special and the whole script exits if it returns non-zero
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| 75 | if test -n "$BASH_VERSION"; then
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| 76 | set -o posix
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| 77 | fi
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| 78 | set -- a b
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| 79 | shift 3
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| 80 | echo status=$?
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| 81 |
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| 82 | ## status: 1
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| 83 | ## STDOUT:
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| 84 | ## END
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| 85 |
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| 86 | ## OK dash status: 2
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| 87 |
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| 88 | ## BUG bash/zsh/ash status: 0
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| 89 | ## BUG bash/zsh/ash STDOUT:
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| 90 | status=1
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| 91 | ## END
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| 92 |
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| 93 | #### set is special and fails, even if using || true
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| 94 | shopt -s invalid_ || true
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| 95 | echo ok
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| 96 | set -o invalid_ || true
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| 97 | echo should not get here
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| 98 |
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| 99 | ## status: 1
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| 100 | ## STDOUT:
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| 101 | ok
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| 102 | ## END
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| 103 |
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| 104 | ## OK dash status: 2
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| 105 |
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| 106 | ## BUG bash/ash status: 0
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| 107 | ## BUG bash/ash STDOUT:
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| 108 | ok
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| 109 | should not get here
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| 110 | ## END
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| 111 |
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| 112 | #### Special builtins can't be redefined as functions (set -o posix)
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| 113 |
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| 114 | # bash manual says they are 'found before' functions.
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| 115 | if test -n "$BASH_VERSION"; then
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| 116 | set -o posix
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| 117 | fi
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| 118 |
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| 119 | export() {
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| 120 | echo 'export func'
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| 121 | }
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| 122 | export hi
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| 123 | echo status=$?
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| 124 | ## status: 2
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| 125 | ## BUG mksh/zsh status: 0
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| 126 | ## BUG mksh/zsh STDOUT:
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| 127 | status=0
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| 128 | ## END
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| 129 |
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| 130 | #### Non-special builtins CAN be redefined as functions
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| 131 | test -n "$BASH_VERSION" && set -o posix
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| 132 | true() {
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| 133 | echo 'true func'
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| 134 | }
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| 135 | true hi
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| 136 | echo status=$?
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| 137 | ## STDOUT:
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| 138 | true func
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| 139 | status=0
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| 140 | ## END
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| 141 |
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| 142 |
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| 143 | #### command, builtin - both can be redefined, not special (regression)
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| 144 | case $SH in dash|ash) exit ;; esac
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| 145 |
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| 146 | builtin echo b
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| 147 | command echo c
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| 148 |
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| 149 | builtin() {
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| 150 | echo builtin-redef "$@"
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| 151 | }
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| 152 |
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| 153 | command() {
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| 154 | echo command-redef "$@"
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| 155 | }
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| 156 |
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| 157 | builtin echo b
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| 158 | command echo c
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| 159 |
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| 160 | ## STDOUT:
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| 161 | b
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| 162 | c
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| 163 | builtin-redef echo b
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| 164 | command-redef echo c
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| 165 | ## END
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| 166 | ## N-I dash/ash STDOUT:
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| 167 | ## END
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