| 1 | ## compare_shells: dash bash-4.4 mksh zsh
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| 2 |
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| 3 | #### implicit for loop
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| 4 | # This is like "for i in $@".
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| 5 | fun() {
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| 6 | for i; do
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| 7 | echo $i
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| 8 | done
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| 9 | }
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| 10 | fun 1 2 3
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| 11 | ## STDOUT:
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| 12 | 1
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| 13 | 2
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| 14 | 3
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| 15 | ## END
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| 16 |
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| 17 | #### empty for loop (has "in")
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| 18 | set -- 1 2 3
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| 19 | for i in ; do
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| 20 | echo $i
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| 21 | done
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| 22 | ## stdout-json: ""
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| 23 |
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| 24 | #### for loop with invalid identifier
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| 25 | # should be compile time error, but runtime error is OK too
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| 26 | for - in a b c; do
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| 27 | echo hi
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| 28 | done
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| 29 | ## stdout-json: ""
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| 30 | ## status: 2
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| 31 | ## OK bash/mksh status: 1
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| 32 | ## BUG zsh stdout: hi
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| 33 | ## BUG zsh status: 1
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| 34 |
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| 35 | #### the word 'in' can be the loop variable
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| 36 |
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| 37 | for in in a b c; do
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| 38 | echo $in
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| 39 | done
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| 40 | ## STDOUT:
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| 41 | a
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| 42 | b
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| 43 | c
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| 44 | ## END
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| 45 |
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| 46 | #### Tilde expansion within for loop
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| 47 | HOME=/home/bob
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| 48 | for name in ~/src ~/git; do
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| 49 | echo $name
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| 50 | done
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| 51 | ## STDOUT:
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| 52 | /home/bob/src
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| 53 | /home/bob/git
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| 54 | ## END
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| 55 |
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| 56 | #### Brace Expansion within Array
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| 57 | for i in -{a,b} {c,d}-; do
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| 58 | echo $i
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| 59 | done
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| 60 | ## STDOUT:
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| 61 | -a
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| 62 | -b
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| 63 | c-
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| 64 | d-
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| 65 | ## END
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| 66 | ## N-I dash STDOUT:
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| 67 | -{a,b}
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| 68 | {c,d}-
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| 69 | ## END
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| 70 |
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| 71 | #### using loop var outside loop
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| 72 | fun() {
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| 73 | for i in a b c; do
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| 74 | echo $i
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| 75 | done
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| 76 | echo $i
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| 77 | }
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| 78 | fun
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| 79 | ## status: 0
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| 80 | ## STDOUT:
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| 81 | a
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| 82 | b
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| 83 | c
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| 84 | c
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| 85 | ## END
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| 86 |
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| 87 | #### continue
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| 88 | for i in a b c; do
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| 89 | echo $i
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| 90 | if test $i = b; then
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| 91 | continue
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| 92 | fi
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| 93 | echo $i
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| 94 | done
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| 95 | ## status: 0
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| 96 | ## STDOUT:
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| 97 | a
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| 98 | a
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| 99 | b
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| 100 | c
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| 101 | c
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| 102 | ## END
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| 103 |
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| 104 | #### break
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| 105 | for i in a b c; do
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| 106 | echo $i
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| 107 | if test $i = b; then
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| 108 | break
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| 109 | fi
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| 110 | done
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| 111 | ## status: 0
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| 112 | ## STDOUT:
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| 113 | a
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| 114 | b
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| 115 | ## END
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| 116 |
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| 117 | #### dynamic control flow (KNOWN INCOMPATIBILITY)
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| 118 | # hm would it be saner to make FATAL builtins called break/continue/etc.?
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| 119 | # On the other hand, this spits out errors loudly.
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| 120 | b=break
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| 121 | for i in 1 2 3; do
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| 122 | echo $i
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| 123 | $b
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| 124 | done
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| 125 | ## STDOUT:
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| 126 | 1
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| 127 | ## END
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| 128 | ## OK osh STDOUT:
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| 129 | 1
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| 130 | 2
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| 131 | 3
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| 132 | ## END
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| 133 | ## OK osh status: 127
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| 134 |
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| 135 | #### while in while condition
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| 136 | # This is a consequence of the grammar
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| 137 | while while true; do echo cond; break; done
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| 138 | do
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| 139 | echo body
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| 140 | break
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| 141 | done
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| 142 | ## STDOUT:
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| 143 | cond
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| 144 | body
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| 145 | ## END
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| 146 |
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| 147 | #### while in pipe
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| 148 | x=$(find spec/ | wc -l)
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| 149 | y=$(find spec/ | while read path; do
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| 150 | echo $path
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| 151 | done | wc -l
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| 152 | )
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| 153 | test $x -eq $y
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| 154 | echo status=$?
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| 155 | ## stdout: status=0
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| 156 |
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| 157 | #### while in pipe with subshell
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| 158 | i=0
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| 159 | seq 3 | ( while read foo; do
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| 160 | i=$((i+1))
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| 161 | #echo $i
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| 162 | done
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| 163 | echo $i )
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| 164 | ## stdout: 3
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| 165 |
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| 166 | #### until loop
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| 167 | # This is just the opposite of while? while ! cond?
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| 168 | until false; do
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| 169 | echo hi
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| 170 | break
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| 171 | done
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| 172 | ## stdout: hi
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| 173 |
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| 174 | #### continue at top level
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| 175 | if true; then
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| 176 | echo one
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| 177 | continue
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| 178 | echo two
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| 179 | fi
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| 180 | ## status: 0
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| 181 | ## STDOUT:
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| 182 | one
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| 183 | two
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| 184 | ## END
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| 185 | # zsh behaves like strict_control_flow!
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| 186 | ## OK zsh status: 1
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| 187 | ## OK zsh STDOUT:
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| 188 | one
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| 189 | ## END
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| 190 |
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| 191 | #### continue in subshell
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| 192 | for i in $(seq 2); do
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| 193 | echo "> $i"
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| 194 | ( if true; then continue; fi; echo "Should not print" )
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| 195 | echo subshell status=$?
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| 196 | echo ". $i"
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| 197 | done
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| 198 | ## STDOUT:
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| 199 | # osh lets you fail
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| 200 | > 1
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| 201 | subshell status=1
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| 202 | . 1
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| 203 | > 2
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| 204 | subshell status=1
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| 205 | . 2
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| 206 | ## END
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| 207 | ## OK dash/bash/zsh STDOUT:
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| 208 | > 1
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| 209 | subshell status=0
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| 210 | . 1
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| 211 | > 2
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| 212 | subshell status=0
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| 213 | . 2
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| 214 | ## END
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| 215 | ## BUG mksh STDOUT:
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| 216 | > 1
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| 217 | Should not print
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| 218 | subshell status=0
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| 219 | . 1
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| 220 | > 2
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| 221 | Should not print
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| 222 | subshell status=0
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| 223 | . 2
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| 224 | ## END
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| 225 |
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| 226 | #### continue in subshell aborts with errexit
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| 227 | # The other shells don't let you recover from this programming error!
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| 228 | set -o errexit
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| 229 | for i in $(seq 2); do
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| 230 | echo "> $i"
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| 231 | ( if true; then continue; fi; echo "Should not print" )
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| 232 | echo 'should fail after subshell'
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| 233 | echo ". $i"
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| 234 | done
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| 235 | ## STDOUT:
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| 236 | > 1
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| 237 | ## END
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| 238 | ## status: 1
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| 239 | ## BUG dash/bash/zsh STDOUT:
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| 240 | > 1
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| 241 | should fail after subshell
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| 242 | . 1
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| 243 | > 2
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| 244 | should fail after subshell
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| 245 | . 2
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| 246 | ## END
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| 247 | ## BUG dash/bash/zsh status: 0
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| 248 | ## BUG mksh STDOUT:
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| 249 | > 1
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| 250 | Should not print
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| 251 | should fail after subshell
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| 252 | . 1
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| 253 | > 2
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| 254 | Should not print
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| 255 | should fail after subshell
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| 256 | . 2
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| 257 | ## END
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| 258 | ## BUG mksh status: 0
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| 259 |
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| 260 | #### bad arg to break
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| 261 | x=oops
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| 262 | while true; do
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| 263 | echo hi
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| 264 | break $x
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| 265 | sleep 0.1
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| 266 | done
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| 267 | ## stdout: hi
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| 268 | ## status: 1
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| 269 | ## OK dash status: 2
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| 270 | ## OK bash status: 128
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| 271 |
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| 272 | #### too many args to continue
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| 273 | # OSH treats this as a parse error
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| 274 | for x in a b c; do
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| 275 | echo $x
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| 276 | # bash breaks rather than continue or fatal error!!!
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| 277 | continue 1 2 3
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| 278 | done
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| 279 | echo --
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| 280 | ## stdout-json: ""
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| 281 | ## status: 2
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| 282 | ## BUG bash STDOUT:
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| 283 | a
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| 284 | --
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| 285 | ## END
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| 286 | ## OK bash status: 0
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| 287 | ## BUG dash/mksh/zsh STDOUT:
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| 288 | a
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| 289 | b
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| 290 | c
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| 291 | --
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| 292 | ## END
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| 293 | ## BUG dash/mksh/zsh status: 0
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| 294 |
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| 295 | #### break in condition of loop
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| 296 | while break; do
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| 297 | echo x
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| 298 | done
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| 299 | echo done
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| 300 | ## STDOUT:
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| 301 | done
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| 302 | ## END
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| 303 |
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| 304 |
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| 305 | #### break in condition of nested loop
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| 306 | for i in 1 2 3; do
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| 307 | echo i=$i
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| 308 | while break; do
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| 309 | echo x
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| 310 | done
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| 311 | done
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| 312 | echo done
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| 313 | ## STDOUT:
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| 314 | i=1
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| 315 | i=2
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| 316 | i=3
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| 317 | done
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| 318 | ## END
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| 319 |
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| 320 | #### return within eval
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| 321 | f() {
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| 322 | echo one
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| 323 | eval 'return'
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| 324 | echo two
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| 325 | }
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| 326 | f
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| 327 | ## STDOUT:
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| 328 | one
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| 329 | ## END
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| 330 |
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| 331 | #### break/continue within eval
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| 332 | # NOTE: This changes things
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| 333 | # set -e
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| 334 | f() {
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| 335 | for i in $(seq 5); do
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| 336 | if test $i = 2; then
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| 337 | eval continue
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| 338 | fi
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| 339 | if test $i = 4; then
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| 340 | eval break
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| 341 | fi
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| 342 | echo $i
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| 343 | done
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| 344 |
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| 345 | eval 'return'
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| 346 | echo 'done'
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| 347 | }
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| 348 | f
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| 349 | ## STDOUT:
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| 350 | 1
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| 351 | 3
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| 352 | ## END
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| 353 | ## BUG mksh STDOUT:
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| 354 | 1
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| 355 | 2
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| 356 | 3
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| 357 | 4
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| 358 | 5
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| 359 | ## END
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| 360 |
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| 361 | #### break/continue within source
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| 362 | # NOTE: This changes things
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| 363 | # set -e
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| 364 |
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| 365 | cd $REPO_ROOT
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| 366 | f() {
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| 367 | for i in $(seq 5); do
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| 368 | if test $i = 2; then
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| 369 | . spec/testdata/continue.sh
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| 370 | fi
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| 371 | if test $i = 4; then
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| 372 | . spec/testdata/break.sh
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| 373 | fi
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| 374 | echo $i
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| 375 | done
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| 376 |
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| 377 | # Return is different!
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| 378 | . spec/testdata/return.sh
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| 379 | echo done
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| 380 | }
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| 381 | f
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| 382 | ## STDOUT:
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| 383 | 1
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| 384 | 3
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| 385 | done
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| 386 | ## END
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| 387 | ## BUG zsh/mksh STDOUT:
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| 388 | 1
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| 389 | 2
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| 390 | 3
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| 391 | 4
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| 392 | 5
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| 393 | done
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| 394 | ## END
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| 395 |
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| 396 | #### top-level break/continue/return (without strict_control_flow)
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| 397 | $SH -c 'break; echo break=$?'
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| 398 | $SH -c 'continue; echo continue=$?'
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| 399 | $SH -c 'return; echo return=$?'
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| 400 | ## STDOUT:
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| 401 | break=0
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| 402 | continue=0
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| 403 | ## END
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| 404 | ## BUG zsh stdout-json: ""
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| 405 | ## BUG bash STDOUT:
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| 406 | break=0
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| 407 | continue=0
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| 408 | return=1
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| 409 | ## END
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| 410 |
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| 411 |
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| 412 | #### multi-level break with argument
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| 413 |
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| 414 | # reported in issue #1459
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| 415 |
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| 416 | counterA=100
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| 417 | counterB=100
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| 418 |
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| 419 | while test "$counterA" -gt 0
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| 420 | do
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| 421 | counterA=$((counterA - 1))
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| 422 | while test "$counterB" -gt 0
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| 423 | do
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| 424 | counterB=$((counterB - 1))
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| 425 | if test "$counterB" = 50
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| 426 | then
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| 427 | break 2
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| 428 | fi
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| 429 | done
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| 430 | done
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| 431 |
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| 432 | echo "$counterA"
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| 433 | echo "$counterB"
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| 434 |
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| 435 | ## STDOUT:
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| 436 | 99
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| 437 | 50
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| 438 | ## END
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| 439 |
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| 440 |
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| 441 | #### multi-level continue
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| 442 |
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| 443 | for i in 1 2; do
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| 444 | for j in a b c; do
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| 445 | if test $j = b; then
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| 446 | continue
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| 447 | fi
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| 448 | echo $i $j
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| 449 | done
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| 450 | done
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| 451 |
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| 452 | echo ---
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| 453 |
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| 454 | for i in 1 2; do
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| 455 | for j in a b c; do
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| 456 | if test $j = b; then
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| 457 | continue 2 # MULTI-LEVEL
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| 458 | fi
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| 459 | echo $i $j
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| 460 | done
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| 461 | done
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| 462 |
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| 463 |
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| 464 | ## STDOUT:
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| 465 | 1 a
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| 466 | 1 c
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| 467 | 2 a
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| 468 | 2 c
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| 469 | ---
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| 470 | 1 a
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| 471 | 2 a
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| 472 | ## END
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| 473 |
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| 474 |
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