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## compare_shells: bash-4.4 dash mksh zsh
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2 |
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i=0
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5 |
x=x
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echo ${x:-$((i++))}
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echo $i
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echo ${undefined:-$((i++))}
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echo $i # i is one because the alternative was only evaluated once
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## status: 0
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## stdout-json: "x\n0\n0\n1\n"
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## N-I dash status: 2
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## N-I dash stdout-json: "x\n0\n"
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empty=''
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echo ${empty:-is empty}
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## stdout: is empty
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echo ${unset-is unset}
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## stdout: is unset
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set -- '1 2' '3 4'
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argv.py X${unset=x"$@"x}X
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argv.py X${unset=x$@x}X # If you want OSH to split, write this
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# osh
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## STDOUT:
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['Xx1', '2', '3', '4xX']
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['Xx1', '2', '3', '4xX']
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## END
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## OK osh STDOUT:
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['Xx1 2', '3 4xX']
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['Xx1', '2', '3', '4xX']
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## END
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## OK zsh STDOUT:
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['Xx1 2 3 4xX']
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['Xx1 2 3 4xX']
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## END
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set -- '1 2' '3 4'
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argv.py "X${unset=x"$@"x}X"
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argv.py "X${unset=x$@x}X" # OSH is the same here
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## STDOUT:
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['Xx1 2 3 4xX']
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['Xx1 2 3 4xX']
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## END
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## BUG bash STDOUT:
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['Xx1', '2', '3', '4xX']
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['Xx1 2 3 4xX']
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## END
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## OK osh STDOUT:
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['Xx1 2', '3 4xX']
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['Xx1 2 3 4xX']
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## END
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set -- '1 2' '3 4'
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argv.py X${unset=x"$@"x}X
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argv.py "$unset"
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## STDOUT:
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['Xx1', '2', '3', '4xX']
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['x1 2 3 4x']
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## END
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## OK osh STDOUT:
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['Xx1 2', '3 4xX']
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['x1 2 3 4x']
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## END
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## OK zsh STDOUT:
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['Xx1 2 3 4xX']
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['x1 2 3 4x']
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## END
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empty=''
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${empty:=is empty}
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echo $empty
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## stdout: is empty
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81 |
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${unset=is unset}
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echo $unset
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## stdout: is unset
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v=foo
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empty=''
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echo ${v:+v is not empty} ${empty:+is not empty}
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## stdout: v is not empty
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v=foo
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echo ${v+v is not unset} ${unset:+is not unset}
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## stdout: v is not unset
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# Python's configure caught this
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argv.py "${with_icc+set}" = set
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## STDOUT:
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['', '=', 'set']
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## END
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set -u
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v=v
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echo v=${v:+foo}
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echo v=${v+foo}
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unset v
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echo v=${v:+foo}
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echo v=${v+foo}
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## STDOUT:
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v=foo
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v=foo
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v=
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v=
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## END
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case $SH in dash) exit ;; esac
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set -u
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typeset -a empty
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empty=()
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echo empty /"${empty[@]}"/
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echo undefined /"${undefined[@]}"/
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## status: 1
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## STDOUT:
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empty //
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## END
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## BUG bash status: 0
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## BUG bash STDOUT:
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empty //
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undefined //
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## END
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# empty array is unset in mksh
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## BUG mksh status: 1
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## BUG mksh STDOUT:
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## END
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## N-I dash status: 0
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## N-I dash STDOUT:
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## END
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case $SH in dash) exit ;; esac
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set -u
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echo plus /"${array[@]+foo}"/
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echo plus colon /"${array[@]:+foo}"/
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## STDOUT:
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plus //
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plus colon //
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## END
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## N-I dash STDOUT:
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## END
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case $SH in dash) exit ;; esac
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echo '+ ' /"${array[@]+foo}"/
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echo '+:' /"${array[@]:+foo}"/
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echo
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typeset -a array
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array=()
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echo '+ ' /"${array[@]+foo}"/
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echo '+:' /"${array[@]:+foo}"/
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echo
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array=('')
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echo '+ ' /"${array[@]+foo}"/
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echo '+:' /"${array[@]:+foo}"/
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echo
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array=(spam eggs)
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echo '+ ' /"${array[@]+foo}"/
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echo '+:' /"${array[@]:+foo}"/
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echo
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## STDOUT:
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+ //
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+: //
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+ //
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+: //
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+ /foo/
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+: /foo/
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+ /foo/
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+: /foo/
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## END
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## BUG mksh STDOUT:
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+ //
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+: //
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+ //
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+: //
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+ /foo/
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+: //
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+ /foo/
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+: /foo/
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## END
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## BUG zsh STDOUT:
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+ //
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+: //
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+ /foo/
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+: //
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+ /foo/
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+: /foo/
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+ /foo/
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+: /foo/
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## END
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## N-I dash STDOUT:
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## END
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case $SH in dash|mksh|zsh) exit ;; esac
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# https://oilshell.zulipchat.com/#narrow/stream/307442-nix/topic/Replacing.20bash.20with.20osh.20in.20Nixpkgs.20stdenv
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argv.py ${!hooksSlice+"${!hooksSlice}"}
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253 |
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declare -a hookSlice=()
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255 |
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argv.py ${!hooksSlice+"${!hooksSlice}"}
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257 |
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foo=42
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bar=43
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260 |
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declare -a hookSlice=(foo bar spam eggs)
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262 |
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argv.py ${!hooksSlice+"${!hooksSlice}"}
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264 |
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## STDOUT:
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[]
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[]
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[]
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## END
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## OK dash/mksh/zsh STDOUT:
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## END
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273 |
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274 |
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set -u
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v=v
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echo v=${v:-foo}
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echo v=${v-foo}
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unset v
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echo v=${v:-foo}
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echo v=${v-foo}
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282 |
## STDOUT:
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v=v
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v=v
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v=foo
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v=foo
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## END
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case $SH in (dash) exit ;; esac
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291 |
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shopt -s compat_array # to refer to array as scalar
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293 |
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empty=()
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295 |
a1=('')
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296 |
a2=('' x)
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a3=(3 4)
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298 |
echo empty=${empty[@]-minus}
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299 |
echo a1=${a1[@]-minus}
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echo a1[0]=${a1[0]-minus}
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301 |
echo a2=${a2[@]-minus}
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echo a3=${a3[@]-minus}
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echo ---
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304 |
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echo empty=${empty[@]+plus}
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echo a1=${a1[@]+plus}
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echo a1[0]=${a1[0]+plus}
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echo a2=${a2[@]+plus}
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echo a3=${a3[@]+plus}
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echo ---
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311 |
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312 |
echo empty=${empty+plus}
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313 |
echo a1=${a1+plus}
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314 |
echo a2=${a2+plus}
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315 |
echo a3=${a3+plus}
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316 |
echo ---
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317 |
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# Test quoted arrays too
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319 |
argv.py "${empty[@]-minus}"
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320 |
argv.py "${empty[@]+plus}"
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argv.py "${a1[@]-minus}"
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argv.py "${a1[@]+plus}"
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argv.py "${a1[0]-minus}"
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324 |
argv.py "${a1[0]+plus}"
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325 |
argv.py "${a2[@]-minus}"
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argv.py "${a2[@]+plus}"
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argv.py "${a3[@]-minus}"
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328 |
argv.py "${a3[@]+plus}"
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329 |
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## STDOUT:
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331 |
empty=minus
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332 |
a1=
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333 |
a1[0]=
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334 |
a2= x
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335 |
a3=3 4
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336 |
---
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337 |
empty=
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338 |
a1=plus
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339 |
a1[0]=plus
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340 |
a2=plus
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341 |
a3=plus
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342 |
---
|
343 |
empty=
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344 |
a1=plus
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345 |
a2=plus
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346 |
a3=plus
|
347 |
---
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348 |
['minus']
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349 |
[]
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350 |
['']
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351 |
['plus']
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352 |
['']
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353 |
['plus']
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354 |
['', 'x']
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355 |
['plus']
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356 |
['3', '4']
|
357 |
['plus']
|
358 |
## END
|
359 |
## N-I dash stdout-json: ""
|
360 |
## N-I zsh stdout-json: "empty=\na1=\n"
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361 |
## N-I zsh status: 1
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362 |
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363 |
|
364 |
echo argv=${@-minus}
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365 |
echo argv=${@+plus}
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366 |
echo argv=${@:-minus}
|
367 |
echo argv=${@:+plus}
|
368 |
## STDOUT:
|
369 |
argv=minus
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370 |
argv=
|
371 |
argv=minus
|
372 |
argv=
|
373 |
## END
|
374 |
## BUG dash/zsh STDOUT:
|
375 |
argv=
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376 |
argv=plus
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377 |
argv=minus
|
378 |
argv=
|
379 |
## END
|
380 |
|
381 |
|
382 |
case $SH in (dash|mksh) exit ;; esac
|
383 |
|
384 |
declare -A empty=()
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385 |
declare -A assoc=(['k']=v)
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386 |
|
387 |
echo empty=${empty[@]-minus}
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388 |
echo empty=${empty[@]+plus}
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389 |
echo assoc=${assoc[@]-minus}
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390 |
echo assoc=${assoc[@]+plus}
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391 |
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392 |
echo ---
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393 |
echo empty=${empty[@]:-minus}
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394 |
echo empty=${empty[@]:+plus}
|
395 |
echo assoc=${assoc[@]:-minus}
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396 |
echo assoc=${assoc[@]:+plus}
|
397 |
## STDOUT:
|
398 |
empty=minus
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399 |
empty=
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400 |
assoc=v
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401 |
assoc=plus
|
402 |
---
|
403 |
empty=minus
|
404 |
empty=
|
405 |
assoc=v
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406 |
assoc=plus
|
407 |
## END
|
408 |
|
409 |
## BUG zsh STDOUT:
|
410 |
empty=
|
411 |
empty=plus
|
412 |
assoc=minus
|
413 |
assoc=
|
414 |
---
|
415 |
empty=minus
|
416 |
empty=
|
417 |
assoc=minus
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418 |
assoc=
|
419 |
## END
|
420 |
|
421 |
## N-I dash/mksh STDOUT:
|
422 |
## END
|
423 |
|
424 |
|
425 |
|
426 |
empty=''
|
427 |
echo ${empty:?'is em'pty} # test eval of error
|
428 |
echo should not get here
|
429 |
## stdout-json: ""
|
430 |
## status: 1
|
431 |
## OK dash status: 2
|
432 |
|
433 |
|
434 |
echo ${unset?is empty}
|
435 |
echo should not get here
|
436 |
## stdout-json: ""
|
437 |
## status: 1
|
438 |
## OK dash status: 2
|
439 |
|
440 |
|
441 |
v=foo
|
442 |
echo ${v+v is not unset} ${unset:+is not unset}
|
443 |
## stdout: v is not unset
|
444 |
|
445 |
|
446 |
f() { : "${hello:=x}"; echo $hello; }
|
447 |
f
|
448 |
echo hello=$hello
|
449 |
|
450 |
f() { hello=x; }
|
451 |
f
|
452 |
echo hello=$hello
|
453 |
## STDOUT:
|
454 |
x
|
455 |
hello=x
|
456 |
hello=x
|
457 |
## END
|
458 |
|
459 |
|
460 |
arr=()
|
461 |
echo ${#arr[@]}
|
462 |
: ${arr[0]=x}
|
463 |
echo ${#arr[@]}
|
464 |
## STDOUT:
|
465 |
0
|
466 |
1
|
467 |
## END
|
468 |
## N-I dash status: 2
|
469 |
## N-I dash stdout-json: ""
|
470 |
## N-I zsh status: 1
|
471 |
## N-I zsh stdout-json: "0\n"
|
472 |
|
473 |
|
474 |
# note: this also works in zsh
|
475 |
|
476 |
declare -A arr=()
|
477 |
echo ${#arr[@]}
|
478 |
: ${arr['k']=x}
|
479 |
echo ${#arr[@]}
|
480 |
## STDOUT:
|
481 |
0
|
482 |
1
|
483 |
## END
|
484 |
## N-I dash status: 2
|
485 |
## N-I dash stdout-json: ""
|
486 |
## N-I mksh status: 1
|
487 |
## N-I mksh stdout-json: ""
|
488 |
|
489 |
|
490 |
echo "${undef-\$}"
|
491 |
echo "${undef-\(}"
|
492 |
echo "${undef-\z}"
|
493 |
echo "${undef-\"}"
|
494 |
echo "${undef-\`}"
|
495 |
echo "${undef-\\}"
|
496 |
## STDOUT:
|
497 |
$
|
498 |
\(
|
499 |
\z
|
500 |
"
|
501 |
`
|
502 |
\
|
503 |
## END
|
504 |
## BUG yash STDOUT:
|
505 |
$
|
506 |
(
|
507 |
z
|
508 |
"
|
509 |
`
|
510 |
\
|
511 |
## END
|
512 |
|
513 |
|
514 |
echo "${undef-\e}"
|
515 |
## STDOUT:
|
516 |
\e
|
517 |
## END
|
518 |
## BUG zsh/mksh stdout-repr: '\x1b\n'
|
519 |
## BUG yash stdout: e
|
520 |
|