| 1 | ## compare_shells: dash bash mksh
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| 2 |
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| 3 | #### case
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| 4 | foo=a; case $foo in [0-9]) echo number;; [a-z]) echo letter;; esac
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| 5 | ## stdout: letter
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| 6 |
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| 7 | #### case in subshell
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| 8 | # Hm this subhell has to know about the closing ) and stuff like that.
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| 9 | # case_clause is a compound_command, which is a command. And a subshell
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| 10 | # takes a compound_list, which is a list of terms, which has and_ors in them
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| 11 | # ... which eventually boils down to a command.
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| 12 | echo $(foo=a; case $foo in [0-9]) echo number;; [a-z]) echo letter;; esac)
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| 13 | ## stdout: letter
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| 14 |
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| 15 | #### Command sub word part
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| 16 | # "The token shall not be delimited by the end of the substitution."
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| 17 | foo=FOO; echo $(echo $foo)bar$(echo $foo)
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| 18 | ## stdout: FOObarFOO
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| 19 |
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| 20 | #### Backtick
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| 21 | foo=FOO; echo `echo $foo`bar`echo $foo`
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| 22 | ## stdout: FOObarFOO
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| 23 |
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| 24 | #### Backtick 2
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| 25 | echo `echo -n l; echo -n s`
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| 26 | ## stdout: ls
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| 27 |
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| 28 | #### Nested backticks
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| 29 | # Inner `` are escaped! Not sure how to do triple.. Seems like an unlikely
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| 30 | # use case. Not sure if I even want to support this!
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| 31 | echo X > $TMP/000000-first
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| 32 | echo `\`echo -n l; echo -n s\` $TMP | grep 000000-first`
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| 33 | ## stdout: 000000-first
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| 34 |
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| 35 | #### Making command out of command sub should work
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| 36 | # Works in bash and dash!
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| 37 | $(echo ec)$(echo ho) split builtin
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| 38 | ## stdout: split builtin
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| 39 |
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| 40 | #### Making keyword out of command sub should NOT work
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| 41 | $(echo f)$(echo or) i in a b c; do echo $i; done
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| 42 | echo status=$?
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| 43 | ## stdout-json: ""
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| 44 | ## status: 2
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| 45 | ## OK mksh status: 1
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| 46 |
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| 47 | #### Command sub with here doc
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| 48 | echo $(<<EOF tac
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| 49 | one
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| 50 | two
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| 51 | EOF
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| 52 | )
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| 53 | ## stdout: two one
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| 54 |
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| 55 | #### Here doc with pipeline
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| 56 | <<EOF tac | tr '\n' 'X'
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| 57 | one
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| 58 | two
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| 59 | EOF
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| 60 | ## stdout-json: "twoXoneX"
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| 61 |
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| 62 | #### Command Sub word split
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| 63 | argv.py $(echo 'hi there') "$(echo 'hi there')"
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| 64 | ## stdout: ['hi', 'there', 'hi there']
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| 65 |
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| 66 | #### Command Sub trailing newline removed
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| 67 | s=$(python2 -c 'print("ab\ncd\n")')
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| 68 | argv.py "$s"
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| 69 | ## stdout: ['ab\ncd']
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| 70 |
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| 71 | #### Command Sub trailing whitespace not removed
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| 72 | s=$(python2 -c 'print("ab\ncd\n ")')
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| 73 | argv.py "$s"
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| 74 | ## stdout: ['ab\ncd\n ']
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| 75 |
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| 76 | #### Command Sub and exit code
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| 77 | # A command resets the exit code, but an assignment doesn't.
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| 78 | echo $(echo x; exit 33)
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| 79 | echo $?
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| 80 | x=$(echo x; exit 33)
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| 81 | echo $?
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| 82 | ## STDOUT:
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| 83 | x
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| 84 | 0
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| 85 | 33
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| 86 | ## END
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| 87 |
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| 88 | #### Command Sub in local sets exit code
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| 89 | # A command resets the exit code, but an assignment doesn't.
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| 90 | f() {
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| 91 | echo $(echo x; exit 33)
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| 92 | echo $?
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| 93 | local x=$(echo x; exit 33)
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| 94 | echo $?
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| 95 | }
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| 96 | f
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| 97 | ## STDOUT:
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| 98 | x
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| 99 | 0
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| 100 | 0
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| 101 | ## END
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| 102 |
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| 103 | #### Double Quotes in Command Sub in Double Quotes
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| 104 | # virtualenv's bin/activate uses this.
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| 105 | # This is weird! Double quotes within `` is different than double quotes
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| 106 | # within $()! All shells agree.
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| 107 | # I think this is related to the nested backticks case!
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| 108 | echo "x $(echo hi)"
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| 109 | echo "x $(echo "hi")"
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| 110 | echo "x $(echo \"hi\")"
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| 111 | echo "x `echo hi`"
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| 112 | echo "x `echo "hi"`"
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| 113 | echo "x `echo \"hi\"`"
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| 114 | ## STDOUT:
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| 115 | x hi
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| 116 | x hi
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| 117 | x "hi"
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| 118 | x hi
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| 119 | x hi
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| 120 | x hi
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| 121 | ## END
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| 122 |
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| 123 | #### Escaped quote in [[ ]]
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| 124 | file=$TMP/command-sub-dbracket
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| 125 | #rm -f $file
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| 126 | echo "123 `[[ $(echo \\" > $file) ]]` 456";
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| 127 | cat $file
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| 128 | ## STDOUT:
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| 129 | 123 456
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| 130 | "
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| 131 | ## END
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| 132 |
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| 133 | #### Quoting " within ``
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| 134 | echo 1 `echo \"`
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| 135 | #echo 2 `echo \\"`
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| 136 | #echo 3 `echo \\\"`
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| 137 | #echo 4 `echo \\\\"`
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| 138 |
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| 139 | ## STDOUT:
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| 140 | 1 "
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| 141 | ## END
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| 142 |
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| 143 | #### Quoting $ within ``
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| 144 | echo 1 `echo $`
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| 145 | echo 2 `echo \$`
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| 146 | echo 3 `echo \\$`
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| 147 | echo 4 `echo \\\$`
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| 148 | echo 5 `echo \\\\$`
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| 149 | ## STDOUT:
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| 150 | 1 $
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| 151 | 2 $
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| 152 | 3 $
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| 153 | 4 $
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| 154 | 5 \$
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| 155 | ## END
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| 156 |
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| 157 | #### Quoting $ within `` within double quotes
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| 158 | echo "1 `echo $`"
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| 159 | echo "2 `echo \$`"
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| 160 | echo "3 `echo \\$`"
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| 161 | echo "4 `echo \\\$`"
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| 162 | echo "5 `echo \\\\$`"
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| 163 | ## STDOUT:
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| 164 | 1 $
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| 165 | 2 $
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| 166 | 3 $
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| 167 | 4 $
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| 168 | 5 \$
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| 169 | ## END
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| 170 |
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| 171 | #### Quoting \ within ``
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| 172 | # You need FOUR backslashes to make a literal \.
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| 173 | echo [1 `echo \ `]
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| 174 | echo [2 `echo \\ `]
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| 175 | echo [3 `echo \\\\ `]
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| 176 | ## STDOUT:
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| 177 | [1 ]
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| 178 | [2 ]
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| 179 | [3 \]
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| 180 | ## END
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| 181 |
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| 182 | #### Quoting \ within `` within double quotes
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| 183 | echo "[1 `echo \ `]"
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| 184 | echo "[2 `echo \\ `]"
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| 185 | echo "[3 `echo \\\\ `]"
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| 186 | ## STDOUT:
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| 187 | [1 ]
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| 188 | [2 ]
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| 189 | [3 \]
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| 190 | ## END
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| 191 |
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| 192 | #### Quoting ( within ``
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| 193 | echo 1 `echo \(`
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| 194 | echo 2 `echo \\(`
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| 195 | echo 3 `echo \\ \\(`
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| 196 | ## STDOUT:
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| 197 | 1 (
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| 198 | 2 (
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| 199 | 3 (
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| 200 | ## END
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| 201 |
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| 202 | #### Quoting ( within `` within double quotes
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| 203 | echo "1 `echo \(`"
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| 204 | echo "2 `echo \\(`"
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| 205 | echo "3 `echo \\ \\(`"
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| 206 | ## STDOUT:
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| 207 | 1 (
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| 208 | 2 (
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| 209 | 3 (
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| 210 | ## END
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| 211 |
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| 212 | #### Quoting non-special characters within ``
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| 213 | echo [1 `echo \z]`
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| 214 | echo [2 `echo \\z]`
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| 215 | echo [3 `echo \\\z]`
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| 216 | echo [4 `echo \\\\z]`
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| 217 | ## STDOUT:
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| 218 | [1 z]
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| 219 | [2 z]
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| 220 | [3 \z]
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| 221 | [4 \z]
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| 222 | ## END
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| 223 |
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| 224 | #### Quoting non-special characters within `` within double quotes
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| 225 | echo "[1 `echo \z`]"
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| 226 | echo "[2 `echo \\z`]"
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| 227 | echo "[3 `echo \\\z`]"
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| 228 | echo "[4 `echo \\\\z`]"
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| 229 | ## STDOUT:
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| 230 | [1 z]
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| 231 | [2 z]
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| 232 | [3 \z]
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| 233 | [4 \z]
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| 234 | ## END
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| 235 |
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| 236 | #### Quoting double quotes within backticks
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| 237 | echo \"foo\" # for comparison
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| 238 | echo `echo \"foo\"`
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| 239 | echo `echo \\"foo\\"`
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| 240 | ## STDOUT:
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| 241 | "foo"
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| 242 | "foo"
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| 243 | "foo"
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| 244 | ## END
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| 245 |
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| 246 | #### More levels of double quotes in backticks
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| 247 |
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| 248 | # Shells don't agree here, some of them give you form feeds!
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| 249 | # There are two levels of processing I don't understand.
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| 250 |
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| 251 | #echo BUG
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| 252 | #exit
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| 253 |
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| 254 | echo `echo \\\"foo\\\"` -
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| 255 | echo `echo \\\\"foo\\\\"` -
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| 256 | echo `echo \\\\\"foo\\\\\"` -
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| 257 |
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| 258 | ## STDOUT:
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| 259 | \foo\ -
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| 260 | \foo\ -
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| 261 | \"foo\" -
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| 262 | ## END
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| 263 |
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| 264 | ## BUG dash/mksh stdout-json: "\u000coo\\ -\n\u000coo\\ -\n\\\"foo\\\" -\n"
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| 265 |
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| 266 | #### Syntax errors with double quotes within backticks
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| 267 |
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| 268 | # bash does print syntax errors but somehow it exits 0
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| 269 |
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| 270 | $SH -c 'echo `echo "`'
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| 271 | echo status=$?
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| 272 | $SH -c 'echo `echo \\\\"`'
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| 273 | echo status=$?
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| 274 |
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| 275 | ## STDOUT:
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| 276 | status=2
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| 277 | status=2
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| 278 | ## END
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| 279 | ## OK mksh STDOUT:
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| 280 | status=1
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| 281 | status=1
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| 282 | ## END
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| 283 | ## OK bash STDOUT:
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| 284 |
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| 285 | status=0
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| 286 |
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| 287 | status=0
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| 288 | ## END
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| 289 |
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| 290 |
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| 291 | #### Empty command sub $() (command::NoOp)
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| 292 |
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| 293 | # IMPORTANT: catch assert() failure in child process!!!
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| 294 | shopt -s command_sub_errexit
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| 295 |
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| 296 | echo -$()- ".$()."
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| 297 | ## STDOUT:
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| 298 | -- ..
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| 299 | ## END
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