| 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 $i
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| 8 | done
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| 9 | echo "finished=$i"
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| 10 | }
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| 11 | fun 1 2 3
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| 12 | ## STDOUT:
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| 13 | 1
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| 14 | 2
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| 15 | 3
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| 16 | finished=3
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| 17 | ## END
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| 18 |
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| 19 | #### empty for loop (has "in")
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| 20 | set -- 1 2 3
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| 21 | for i in ; do
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| 22 | echo $i
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| 23 | done
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| 24 | ## STDOUT:
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| 25 | ## END
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| 26 |
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| 27 | #### for loop with invalid identifier
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| 28 | # should be compile time error, but runtime error is OK too
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| 29 | for - in a b c; do
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| 30 | echo hi
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| 31 | done
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| 32 | ## stdout-json: ""
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| 33 | ## status: 2
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| 34 | ## OK bash/mksh status: 1
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| 35 | ## BUG zsh stdout: hi
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| 36 | ## BUG zsh status: 1
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| 37 |
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| 38 | #### the word 'in' can be the loop variable
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| 39 |
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| 40 | for in in a b c; do
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| 41 | echo $in
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| 42 | done
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| 43 | echo finished=$in
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| 44 | ## STDOUT:
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| 45 | a
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| 46 | b
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| 47 | c
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| 48 | finished=c
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| 49 | ## END
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| 50 |
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| 51 | #### Tilde expansion within for loop
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| 52 | HOME=/home/bob
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| 53 | for name in ~/src ~/git; do
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| 54 | echo $name
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| 55 | done
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| 56 | ## STDOUT:
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| 57 | /home/bob/src
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| 58 | /home/bob/git
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| 59 | ## END
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| 60 |
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| 61 | #### Brace Expansion within Array
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| 62 | for i in -{a,b} {c,d}-; do
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| 63 | echo $i
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| 64 | done
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| 65 | ## STDOUT:
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| 66 | -a
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| 67 | -b
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| 68 | c-
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| 69 | d-
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| 70 | ## END
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| 71 | ## N-I dash STDOUT:
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| 72 | -{a,b}
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| 73 | {c,d}-
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| 74 | ## END
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| 75 |
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| 76 | #### using loop var outside loop
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| 77 | fun() {
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| 78 | for i in a b c; do
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| 79 | echo $i
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| 80 | done
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| 81 | echo $i
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| 82 | }
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| 83 | fun
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| 84 | ## status: 0
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| 85 | ## STDOUT:
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| 86 | a
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| 87 | b
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| 88 | c
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| 89 | c
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| 90 | ## END
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| 91 |
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| 92 | #### continue
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| 93 | for i in a b c; do
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| 94 | echo $i
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| 95 | if test $i = b; then
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| 96 | continue
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| 97 | fi
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| 98 | echo $i
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| 99 | done
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| 100 | ## status: 0
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| 101 | ## STDOUT:
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| 102 | a
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| 103 | a
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| 104 | b
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| 105 | c
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| 106 | c
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| 107 | ## END
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| 108 |
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| 109 | #### break
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| 110 | for i in a b c; do
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| 111 | echo $i
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| 112 | if test $i = b; then
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| 113 | break
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| 114 | fi
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| 115 | done
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| 116 | ## status: 0
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| 117 | ## STDOUT:
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| 118 | a
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| 119 | b
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| 120 | ## END
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| 121 |
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| 122 | #### dynamic control flow (KNOWN INCOMPATIBILITY)
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| 123 | # hm would it be saner to make FATAL builtins called break/continue/etc.?
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| 124 | # On the other hand, this spits out errors loudly.
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| 125 | b=break
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| 126 | for i in 1 2 3; do
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| 127 | echo $i
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| 128 | $b
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| 129 | done
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| 130 | ## STDOUT:
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| 131 | 1
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| 132 | ## END
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| 133 | ## OK osh STDOUT:
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| 134 | 1
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| 135 | 2
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| 136 | 3
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| 137 | ## END
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| 138 | ## OK osh status: 127
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| 139 |
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| 140 | #### while in while condition
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| 141 | # This is a consequence of the grammar
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| 142 | while while true; do echo cond; break; done
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| 143 | do
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| 144 | echo body
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| 145 | break
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| 146 | done
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| 147 | ## STDOUT:
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| 148 | cond
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| 149 | body
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| 150 | ## END
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| 151 |
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| 152 | #### while in pipe
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| 153 | x=$(find spec/ | wc -l)
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| 154 | y=$(find spec/ | while read path; do
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| 155 | echo $path
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| 156 | done | wc -l
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| 157 | )
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| 158 | test $x -eq $y
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| 159 | echo status=$?
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| 160 | ## stdout: status=0
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| 161 |
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| 162 | #### while in pipe with subshell
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| 163 | i=0
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| 164 | seq 3 | ( while read foo; do
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| 165 | i=$((i+1))
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| 166 | #echo $i
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| 167 | done
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| 168 | echo $i )
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| 169 | ## stdout: 3
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| 170 |
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| 171 | #### until loop
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| 172 | # This is just the opposite of while? while ! cond?
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| 173 | until false; do
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| 174 | echo hi
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| 175 | break
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| 176 | done
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| 177 | ## stdout: hi
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| 178 |
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| 179 | #### continue at top level
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| 180 | if true; then
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| 181 | echo one
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| 182 | continue
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| 183 | echo two
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| 184 | fi
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| 185 | ## status: 0
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| 186 | ## STDOUT:
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| 187 | one
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| 188 | two
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| 189 | ## END
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| 190 | # zsh behaves like strict_control_flow!
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| 191 | ## OK zsh status: 1
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| 192 | ## OK zsh STDOUT:
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| 193 | one
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| 194 | ## END
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| 195 |
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| 196 | #### continue in subshell
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| 197 | for i in $(seq 2); do
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| 198 | echo "> $i"
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| 199 | ( if true; then continue; fi; echo "Should not print" )
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| 200 | echo subshell status=$?
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| 201 | echo ". $i"
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| 202 | done
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| 203 | ## STDOUT:
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| 204 | # osh lets you fail
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| 205 | > 1
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| 206 | subshell status=1
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| 207 | . 1
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| 208 | > 2
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| 209 | subshell status=1
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| 210 | . 2
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| 211 | ## END
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| 212 | ## OK dash/bash/zsh STDOUT:
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| 213 | > 1
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| 214 | subshell status=0
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| 215 | . 1
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| 216 | > 2
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| 217 | subshell status=0
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| 218 | . 2
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| 219 | ## END
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| 220 | ## BUG mksh STDOUT:
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| 221 | > 1
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| 222 | Should not print
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| 223 | subshell status=0
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| 224 | . 1
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| 225 | > 2
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| 226 | Should not print
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| 227 | subshell status=0
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| 228 | . 2
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| 229 | ## END
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| 230 |
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| 231 | #### continue in subshell aborts with errexit
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| 232 | # The other shells don't let you recover from this programming error!
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| 233 | set -o errexit
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| 234 | for i in $(seq 2); do
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| 235 | echo "> $i"
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| 236 | ( if true; then continue; fi; echo "Should not print" )
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| 237 | echo 'should fail after subshell'
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| 238 | echo ". $i"
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| 239 | done
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| 240 | ## STDOUT:
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| 241 | > 1
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| 242 | ## END
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| 243 | ## status: 1
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| 244 | ## BUG dash/bash/zsh STDOUT:
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| 245 | > 1
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| 246 | should fail after subshell
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| 247 | . 1
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| 248 | > 2
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| 249 | should fail after subshell
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| 250 | . 2
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| 251 | ## END
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| 252 | ## BUG dash/bash/zsh status: 0
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| 253 | ## BUG mksh STDOUT:
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| 254 | > 1
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| 255 | Should not print
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| 256 | should fail after subshell
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| 257 | . 1
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| 258 | > 2
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| 259 | Should not print
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| 260 | should fail after subshell
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| 261 | . 2
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| 262 | ## END
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| 263 | ## BUG mksh status: 0
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| 264 |
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| 265 | #### bad arg to break
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| 266 | x=oops
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| 267 | while true; do
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| 268 | echo hi
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| 269 | break $x
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| 270 | sleep 0.1
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| 271 | done
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| 272 | ## stdout: hi
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| 273 | ## status: 1
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| 274 | ## OK dash status: 2
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| 275 | ## OK bash status: 128
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| 276 |
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| 277 | #### too many args to continue
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| 278 | # OSH treats this as a parse error
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| 279 | for x in a b c; do
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| 280 | echo $x
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| 281 | # bash breaks rather than continue or fatal error!!!
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| 282 | continue 1 2 3
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| 283 | done
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| 284 | echo --
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| 285 | ## stdout-json: ""
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| 286 | ## status: 2
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| 287 | ## BUG bash STDOUT:
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| 288 | a
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| 289 | --
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| 290 | ## END
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| 291 | ## BUG bash status: 0
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| 292 | ## BUG dash/mksh/zsh STDOUT:
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| 293 | a
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| 294 | b
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| 295 | c
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| 296 | --
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| 297 | ## END
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| 298 | ## BUG dash/mksh/zsh status: 0
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| 299 |
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| 300 | #### break in condition of loop
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| 301 | while break; do
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| 302 | echo x
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| 303 | done
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| 304 | echo done
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| 305 | ## STDOUT:
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| 306 | done
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| 307 | ## END
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| 308 |
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| 309 |
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| 310 | #### break in condition of nested loop
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| 311 | for i in 1 2 3; do
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| 312 | echo i=$i
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| 313 | while break; do
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| 314 | echo x
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| 315 | done
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| 316 | done
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| 317 | echo done
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| 318 | ## STDOUT:
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| 319 | i=1
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| 320 | i=2
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| 321 | i=3
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| 322 | done
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| 323 | ## END
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| 324 |
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| 325 | #### return within eval
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| 326 | f() {
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| 327 | echo one
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| 328 | eval 'return'
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| 329 | echo two
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| 330 | }
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| 331 | f
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| 332 | ## STDOUT:
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| 333 | one
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| 334 | ## END
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| 335 |
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| 336 | #### break/continue within eval
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| 337 | # NOTE: This changes things
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| 338 | # set -e
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| 339 | f() {
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| 340 | for i in $(seq 5); do
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| 341 | if test $i = 2; then
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| 342 | eval continue
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| 343 | fi
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| 344 | if test $i = 4; then
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| 345 | eval break
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| 346 | fi
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| 347 | echo $i
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| 348 | done
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| 349 |
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| 350 | eval 'return'
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| 351 | echo 'done'
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| 352 | }
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| 353 | f
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| 354 | ## STDOUT:
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| 355 | 1
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| 356 | 3
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| 357 | ## END
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| 358 | ## BUG mksh STDOUT:
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| 359 | 1
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| 360 | 2
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| 361 | 3
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| 362 | 4
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| 363 | 5
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| 364 | ## END
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| 365 |
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| 366 | #### break/continue within source
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| 367 | # NOTE: This changes things
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| 368 | # set -e
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| 369 |
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| 370 | cd $REPO_ROOT
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| 371 | f() {
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| 372 | for i in $(seq 5); do
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| 373 | if test $i = 2; then
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| 374 | . spec/testdata/continue.sh
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| 375 | fi
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| 376 | if test $i = 4; then
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| 377 | . spec/testdata/break.sh
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| 378 | fi
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| 379 | echo $i
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| 380 | done
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| 381 |
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| 382 | # Return is different!
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| 383 | . spec/testdata/return.sh
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| 384 | echo done
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| 385 | }
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| 386 | f
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| 387 | ## STDOUT:
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| 388 | 1
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| 389 | 3
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| 390 | done
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| 391 | ## END
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| 392 | ## BUG zsh/mksh STDOUT:
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| 393 | 1
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| 394 | 2
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| 395 | 3
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| 396 | 4
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| 397 | 5
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| 398 | done
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| 399 | ## END
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| 400 |
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| 401 | #### top-level break/continue/return (without strict_control_flow)
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| 402 | $SH -c 'break; echo break=$?'
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| 403 | $SH -c 'continue; echo continue=$?'
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| 404 | $SH -c 'return; echo return=$?'
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| 405 | ## STDOUT:
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| 406 | break=0
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| 407 | continue=0
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| 408 | ## END
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| 409 | ## BUG zsh stdout-json: ""
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| 410 | ## BUG bash STDOUT:
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| 411 | break=0
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| 412 | continue=0
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| 413 | return=1
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| 414 | ## END
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| 415 |
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| 416 |
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| 417 | #### multi-level break with argument
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| 418 |
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| 419 | # reported in issue #1459
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| 420 |
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| 421 | counterA=100
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| 422 | counterB=100
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| 423 |
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| 424 | while test "$counterA" -gt 0
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| 425 | do
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| 426 | counterA=$((counterA - 1))
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| 427 | while test "$counterB" -gt 0
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| 428 | do
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| 429 | counterB=$((counterB - 1))
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| 430 | if test "$counterB" = 50
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| 431 | then
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| 432 | break 2
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| 433 | fi
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| 434 | done
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| 435 | done
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| 436 |
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| 437 | echo "$counterA"
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| 438 | echo "$counterB"
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| 439 |
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| 440 | ## STDOUT:
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| 441 | 99
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| 442 | 50
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| 443 | ## END
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| 444 |
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| 445 |
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| 446 | #### multi-level continue
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| 447 |
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| 448 | for i in 1 2; do
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| 449 | for j in a b c; do
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| 450 | if test $j = b; then
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| 451 | continue
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| 452 | fi
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| 453 | echo $i $j
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| 454 | done
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| 455 | done
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| 456 |
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| 457 | echo ---
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| 458 |
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| 459 | for i in 1 2; do
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| 460 | for j in a b c; do
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| 461 | if test $j = b; then
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| 462 | continue 2 # MULTI-LEVEL
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| 463 | fi
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| 464 | echo $i $j
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| 465 | done
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| 466 | done
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| 467 |
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| 468 |
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| 469 | ## STDOUT:
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| 470 | 1 a
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| 471 | 1 c
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| 472 | 2 a
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| 473 | 2 c
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| 474 | ---
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| 475 | 1 a
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| 476 | 2 a
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| 477 | ## END
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| 478 |
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| 479 |
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