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runtime(sh): Add handling for ksh93 shared-state comsubs and mksh valsubs (#13884)

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This commit adds support for ksh93 shared-state command
substitutions (syntax: ${ command; }) and mksh's value
substitutions (syntax: ${|command;}) in the sh syntax script.

Also add a syntax test for ksh subshares with dumps included
to make sure it doesn't regress.

fixes: #9514

Signed-off-by: Johnothan King <johnothanking@protonmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
This commit is contained in:
Johnothan King 2024-01-22 11:19:54 -08:00 committed by GitHub
parent 7c71db3a58
commit add31baeda
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GPG Key ID: B5690EEEBB952194
6 changed files with 155 additions and 11 deletions
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37
runtime/syntax/sh.vim
View File

@ -138,17 +138,17 @@ endif
syn cluster shArithParenList contains=shArithmetic,shArithParen,shCaseEsac,shComment,shDeref,shDo,shDerefSimple,shEcho,shEscape,shNumber,shOperator,shPosnParm,shExSingleQuote,shExDoubleQuote,shHereString,shRedir,shSingleQuote,shDoubleQuote,shStatement,shVariable,shAlias,shTest,shCtrlSeq,shSpecial,shParen,bashSpecialVariables,bashStatement,shIf,shFor,shFunctionKey,shFunctionOne,shFunctionTwo
syn cluster shArithList contains=@shArithParenList,shParenError
syn cluster shCaseEsacList contains=shCaseStart,shCaseLabel,shCase,shCaseBar,shCaseIn,shComment,shDeref,shDerefSimple,shCaseCommandSub,shCaseExSingleQuote,shCaseSingleQuote,shCaseDoubleQuote,shCtrlSeq,@shErrorList,shStringSpecial,shCaseRange
syn cluster shCaseList contains=@shCommandSubList,shCaseEsac,shColon,shCommandSub,shCommandSubBQ,shComment,shDblBrace,shDo,shEcho,shExpr,shFor,shHereDoc,shIf,shHereString,shRedir,shSetList,shSource,shStatement,shVariable,shCtrlSeq
syn cluster shCaseList contains=@shCommandSubList,shCaseEsac,shColon,shCommandSub,shCommandSubBQ,shSubshare,shValsub,shComment,shDblBrace,shDo,shEcho,shExpr,shFor,shHereDoc,shIf,shHereString,shRedir,shSetList,shSource,shStatement,shVariable,shCtrlSeq
if exists("b:is_kornshell") || exists("b:is_bash")
syn cluster shCaseList add=shForPP,shDblParen
endif
syn cluster shCommandSubList contains=shAlias,shArithmetic,shCmdParenRegion,shCommandSub,shComment,shCtrlSeq,shDeref,shDerefSimple,shDoubleQuote,shEcho,shEscape,shExDoubleQuote,shExpr,shExSingleQuote,shHereDoc,shNumber,shOperator,shOption,shPosnParm,shHereString,shRedir,shSingleQuote,shSpecial,shStatement,shSubSh,shTest,shVariable
syn cluster shCurlyList contains=shNumber,shComma,shDeref,shDerefSimple,shDerefSpecial
" COMBAK: removing shEscape from shDblQuoteList fails ksh04:43 -- Jun 09, 2022: I don't see the problem with ksh04, so am reinstating shEscape
syn cluster shDblQuoteList contains=shArithmetic,shCommandSub,shCommandSubBQ,shDeref,shDerefSimple,shEscape,shPosnParm,shCtrlSeq,shSpecial,shSpecialDQ
syn cluster shDblQuoteList contains=shArithmetic,shCommandSub,shCommandSubBQ,shSubshare,shValsub,shDeref,shDerefSimple,shEscape,shPosnParm,shCtrlSeq,shSpecial,shSpecialDQ
syn cluster shDerefList contains=shDeref,shDerefSimple,shDerefVar,shDerefSpecial,shDerefWordError,shDerefPSR,shDerefPPS
syn cluster shDerefVarList contains=shDerefOffset,shDerefOp,shDerefVarArray,shDerefOpError
syn cluster shEchoList contains=shArithmetic,shCommandSub,shCommandSubBQ,shDeref,shDerefSimple,shEscape,shExSingleQuote,shExDoubleQuote,shSingleQuote,shDoubleQuote,shCtrlSeq,shEchoQuote
syn cluster shEchoList contains=shArithmetic,shCommandSub,shCommandSubBQ,shSubshare,shValsub,shDeref,shDerefSimple,shEscape,shExSingleQuote,shExDoubleQuote,shSingleQuote,shDoubleQuote,shCtrlSeq,shEchoQuote
syn cluster shExprList1 contains=shCharClass,shNumber,shOperator,shExSingleQuote,shExDoubleQuote,shSingleQuote,shDoubleQuote,shExpr,shDblBrace,shDeref,shDerefSimple,shCtrlSeq
syn cluster shExprList2 contains=@shExprList1,@shCaseList,shTest
syn cluster shFunctionList contains=@shCommandSubList,shCaseEsac,shColon,shComment,shDo,shEcho,shExpr,shFor,shHereDoc,shIf,shOption,shHereString,shRedir,shSetList,shSource,shStatement,shVariable,shOperator,shCtrlSeq
@ -159,24 +159,29 @@ endif
syn cluster shHereBeginList contains=@shCommandSubList
syn cluster shHereList contains=shBeginHere,shHerePayload
syn cluster shHereListDQ contains=shBeginHere,@shDblQuoteList,shHerePayload
syn cluster shIdList contains=shArithmetic,shCommandSub,shCommandSubBQ,shWrapLineOperator,shSetOption,shComment,shDeref,shDerefSimple,shHereString,shNumber,shOperator,shRedir,shExSingleQuote,shExDoubleQuote,shSingleQuote,shDoubleQuote,shExpr,shCtrlSeq,shStringSpecial,shAtExpr
syn cluster shIdList contains=shArithmetic,shCommandSub,shCommandSubBQ,shSubshare,shValsub,shWrapLineOperator,shSetOption,shComment,shDeref,shDerefSimple,shHereString,shNumber,shOperator,shRedir,shExSingleQuote,shExDoubleQuote,shSingleQuote,shDoubleQuote,shExpr,shCtrlSeq,shStringSpecial,shAtExpr
syn cluster shIfList contains=@shLoopList,shDblBrace,shDblParen,shFunctionKey,shFunctionOne,shFunctionTwo
syn cluster shLoopList contains=@shCaseList,@shErrorList,shCaseEsac,shConditional,shDblBrace,shExpr,shFor,shIf,shOption,shSet,shTest,shTestOpr,shTouch
if exists("b:is_kornshell") || exists("b:is_bash")
syn cluster shLoopList add=shForPP,shDblParen
endif
syn cluster shPPSLeftList contains=shAlias,shArithmetic,shCmdParenRegion,shCommandSub,shCtrlSeq,shDeref,shDerefSimple,shDoubleQuote,shEcho,shEscape,shExDoubleQuote,shExpr,shExSingleQuote,shHereDoc,shNumber,shOperator,shOption,shPosnParm,shHereString,shRedir,shSingleQuote,shSpecial,shStatement,shSubSh,shTest,shVariable
syn cluster shPPSLeftList contains=shAlias,shArithmetic,shCmdParenRegion,shCommandSub,shSubshare,shValsub,shCtrlSeq,shDeref,shDerefSimple,shDoubleQuote,shEcho,shEscape,shExDoubleQuote,shExpr,shExSingleQuote,shHereDoc,shNumber,shOperator,shOption,shPosnParm,shHereString,shRedir,shSingleQuote,shSpecial,shStatement,shSubSh,shTest,shVariable
syn cluster shPPSRightList contains=shDeref,shDerefSimple,shEscape,shPosnParm
syn cluster shSubShList contains=@shCommandSubList,shCommandSubBQ,shCaseEsac,shColon,shCommandSub,shComment,shDo,shEcho,shExpr,shFor,shIf,shHereString,shRedir,shSetList,shSource,shStatement,shVariable,shCtrlSeq,shOperator
syn cluster shTestList contains=shArithmetic,shCharClass,shCommandSub,shCommandSubBQ,shCtrlSeq,shDeref,shDerefSimple,shDoubleQuote,shSpecialDQ,shExDoubleQuote,shExpr,shExSingleQuote,shNumber,shOperator,shSingleQuote,shTest,shTestOpr
syn cluster shSubShList contains=@shCommandSubList,shCommandSubBQ,shSubshare,shValsub,shCaseEsac,shColon,shCommandSub,shComment,shDo,shEcho,shExpr,shFor,shIf,shHereString,shRedir,shSetList,shSource,shStatement,shVariable,shCtrlSeq,shOperator
syn cluster shTestList contains=shArithmetic,shCharClass,shCommandSub,shCommandSubBQ,shSubshare,shValsub,shCtrlSeq,shDeref,shDerefSimple,shDoubleQuote,shSpecialDQ,shExDoubleQuote,shExpr,shExSingleQuote,shNumber,shOperator,shSingleQuote,shTest,shTestOpr
syn cluster shNoZSList contains=shSpecialNoZS
syn cluster shForList contains=shTestOpr,shNumber,shDerefSimple,shDeref,shCommandSub,shCommandSubBQ,shArithmetic
syn cluster shForList contains=shTestOpr,shNumber,shDerefSimple,shDeref,shCommandSub,shCommandSubBQ,shSubshare,shValsub,shArithmetic
" Echo: {{{1
" ====
" This one is needed INSIDE a CommandSub, so that `echo bla` be correct
syn region shEcho matchgroup=shStatement start="\<echo\>" skip="\\$" matchgroup=shEchoDelim end="$" matchgroup=NONE end="[<>;&|()`]"me=e-1 end="\d[<>]"me=e-2 end="#"me=e-1 contains=@shEchoList skipwhite nextgroup=shQuickComment
syn region shEcho matchgroup=shStatement start="\<print\>" skip="\\$" matchgroup=shEchoDelim end="$" matchgroup=NONE end="[<>;&|()`]"me=e-1 end="\d[<>]"me=e-2 end="#"me=e-1 contains=@shEchoList skipwhite nextgroup=shQuickComment
if exists("b:is_kornshell")
syn region shEcho matchgroup=shStatement start="\<echo\>" skip="\\$" matchgroup=shEchoDelim end="$" matchgroup=NONE end="[<>;&|()`}]"me=e-1 end="\d[<>]"me=e-2 end="#"me=e-1 end="\ze[ \t\n;]}" contains=@shEchoList skipwhite nextgroup=shQuickComment
syn region shEcho matchgroup=shStatement start="\<print\>" skip="\\$" matchgroup=shEchoDelim end="$" matchgroup=NONE end="[<>;&|()`}]"me=e-1 end="\d[<>]"me=e-2 end="#"me=e-1 end="\ze[ \t\n;]}" contains=@shEchoList skipwhite nextgroup=shQuickComment
else
syn region shEcho matchgroup=shStatement start="\<echo\>" skip="\\$" matchgroup=shEchoDelim end="$" matchgroup=NONE end="[<>;&|()`]"me=e-1 end="\d[<>]"me=e-2 end="#"me=e-1 contains=@shEchoList skipwhite nextgroup=shQuickComment
syn region shEcho matchgroup=shStatement start="\<print\>" skip="\\$" matchgroup=shEchoDelim end="$" matchgroup=NONE end="[<>;&|()`]"me=e-1 end="\d[<>]"me=e-2 end="#"me=e-1 contains=@shEchoList skipwhite nextgroup=shQuickComment
endif
if exists("b:is_kornshell") || exists("b:is_bash") || exists("b:is_posix")
syn region shEchoDeref contained matchgroup=shStatement start="\<echo\>" skip="\\$" matchgroup=shEchoDelim end="$" end="[<>;&|()`}]"me=e-1 end="\d[<>]"me=e-2 end="#"me=e-1 contains=@shEchoList skipwhite nextgroup=shQuickComment
syn region shEchoDeref contained matchgroup=shStatement start="\<print\>" skip="\\$" matchgroup=shEchoDelim end="$" end="[<>;&|()`}]"me=e-1 end="\d[<>]"me=e-2 end="#"me=e-1 contains=@shEchoList skipwhite nextgroup=shQuickComment
@ -336,6 +341,10 @@ syn match shEscape contained '\%(^\)\@!\%(\\\\\)*\\.' nextgroup=shComment
" an Error under /bin/sh. By consensus of vimdev'ers!
if exists("b:is_kornshell") || exists("b:is_bash") || exists("b:is_posix")
syn region shCommandSub matchgroup=shCmdSubRegion start="\$(\ze[^(]" skip='\\\\\|\\.' end=")" contains=@shCommandSubList
if exists("b:is_kornshell")
syn region shSubshare matchgroup=shCmdSubRegion start="\${\ze[ \t\n<]" skip='\\\\\|\\.' end="\zs[ \t\n;]}" contains=@shCommandSubList
syn region shValsub matchgroup=shCmdSubRegion start="\${|" skip='\\\\\|\\.' end="}" contains=@shCommandSubList
endif
syn region shArithmetic matchgroup=shArithRegion start="\$((" skip='\\\\\|\\.' end="))" contains=@shArithList
syn region shArithmetic matchgroup=shArithRegion start="\$\[" skip='\\\\\|\\.' end="\]" contains=@shArithList
syn match shSkipInitWS contained "^\s\+"
@ -491,7 +500,11 @@ if !exists("g:sh_no_error")
syn match shDerefWordError "[^}$[~]" contained
endif
syn match shDerefSimple "\$\%(\h\w*\|\d\)" nextgroup=@shNoZSList
syn region shDeref matchgroup=PreProc start="\${" end="}" contains=@shDerefList,shDerefVarArray nextgroup=shSpecialStart
if exists("b:is_kornshell")
syn region shDeref matchgroup=PreProc start="\${\ze[^ \t\n<|]" end="}" contains=@shDerefList,shDerefVarArray nextgroup=shSpecialStart
else
syn region shDeref matchgroup=PreProc start="\${" end="}" contains=@shDerefList,shDerefVarArray nextgroup=shSpecialStart
endif
syn match shDerefSimple "\$[-#*@!?]" nextgroup=@shNoZSList
syn match shDerefSimple "\$\$" nextgroup=@shNoZSList
syn match shDerefSimple "\${\d}" nextgroup=@shNoZSList nextgroup=shSpecialStart
@ -754,6 +767,8 @@ if !exists("skip_sh_syntax_inits")
hi def link shSnglCase Statement
hi def link shCommandSub Special
hi def link shCommandSubBQ shCommandSub
hi def link shSubshare shCommandSub
hi def link shValsub shCommandSub
hi def link shComment Comment
hi def link shConditional Conditional
hi def link shCtrlSeq Special

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@ -0,0 +1,20 @@
>#+0#0000e05#ffffff0|!|/|b|i|n|/|k|s|h| +0#0000000&@64
@75
|#+0#0000e05&| |T|h|i|s| |s|c|r|i|p|t| |i|s| |a| |t|e|s|t| |f|i|l|e| |f|o|r| |k|s|h|9|3| |s|h|a|r|e|d|-|s|t|a|t|e| +0#0000000&@23
|#+0#0000e05&| |c|o|m@1|a|n|d| |s|u|b|s|t|i|t|u|t|i|o|n|s| |(|s|u|b|s|h|a|r|e|s|)| |a|n|d| |m|k|s|h| |v|a|l|u|e| +0#0000000&@24
|#+0#0000e05&| |s|u|b|s|t|i|t|u|t|i|o|n|s| |(|v|a|l|s|u|b|s|)|.| +0#0000000&@48
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|#+0#0000e05&| |=@5| +0#0000000&@66
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|p+0#af5f00255&|r|i|n|t| +0#e000002&|$+0#e000e06&|{| |e+0#af5f00255&|c|h|o| +0#e000002&|o|n|e| +0#e000e06&|}| +0#0000000&@55
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|}+0#e000e06&| +0#0000000&@73
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|p+0#af5f00255&|r|i|n|t| +0#e000002&|$+0#e000e06&|{| |e+0#af5f00255&|c|h|o| +0#e000002&|'+0#af5f00255&|s+0#e000002&|i|x|'+0#af5f00255&| +0#0000000&@55
|}+0#e000e06&| +0#0000000&@73
|p+0#af5f00255&|r|i|n|t| +0#e000002&|$+0#e000e06&|{| @7|e+0#af5f00255&|c|h|o| +0#e000002&|'+0#af5f00255&|s+0#e000002&|e|v|e|n|'+0#af5f00255&| +0#e000e06&@3|}| +0#0000000&@41
|e+0#af5f00255&|c|h|o| +0#e000002&|$+0#e000e06&|{| |p+0#af5f00255&|r|i|n|t| +0#e000002&|'+0#af5f00255&|e+0#e000002&|i|g|h|t|'+0#af5f00255&| +0#e000e06&@2|}| +0#0000000&@49
|i|s|_|k|o|r|n|s|h|e|l@1|:| |1|,| @40|1|,|1| @10|T|o|p|

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@ -0,0 +1,20 @@
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|p+0#af5f00255&|r|i|n|t| +0#e000002&|$+0#e000e06&|{| |e+0#af5f00255&|c|h|o| +0#e000002&|'+0#af5f00255&|f+0#e000002&|i|v|e|'+0#af5f00255&| +0#e000002&|;+0#e000e06&|}| +0#0000000&@51
|p+0#af5f00255&|r|i|n|t| +0#e000002&|$+0#e000e06&|{| |e+0#af5f00255&|c|h|o| +0#e000002&|'+0#af5f00255&|s+0#e000002&|i|x|'+0#af5f00255&| +0#0000000&@55
|}+0#e000e06&| +0#0000000&@73
|p+0#af5f00255&|r|i|n|t| +0#e000002&|$+0#e000e06&|{| @7|e+0#af5f00255&|c|h|o| +0#e000002&|'+0#af5f00255&|s+0#e000002&|e|v|e|n|'+0#af5f00255&| +0#e000e06&@3|}| +0#0000000&@41
>e+0#af5f00255&|c|h|o| +0#e000002&|$+0#e000e06&|{| |p+0#af5f00255&|r|i|n|t| +0#e000002&|'+0#af5f00255&|e+0#e000002&|i|g|h|t|'+0#af5f00255&| +0#e000e06&@2|}| +0#0000000&@49
|t+0#af5f00255&|y|p|e|s|e|t| +0#0000000&|n+0#00e0e07&|i|n|e|=+0#0000000&|$+0#e000e06&|{| |p+0#af5f00255&|w|d|;| +0#e000e06&|}| +0#0000000&@52
@75
|#+0#0000e05&| |=@5| +0#0000000&@66
|#+0#0000e05&| |V|a|l|u|e| |s|u|b|s|t|i|t|u|t|i|o|n|s| |o|f| |t|h|e| |f|o|r|m| |$|{|||c|o|m@1|a|n|d|}| |a|r|e| |o|n|l|y| +0#0000000&@20
|#+0#0000e05&| |s|u|p@1|o|r|t|e|d| |b|y| |m|k|s|h|,| |n|o|t| |k|s|h|9|3|.| +0#0000000&@43
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| +0#00e0e07&@7|v|a|l|s|u|b|f|u|n|c|(|)| |{| +0#0000000&@52
@16|R+0#e000e06&|E|P|L|Y|=+0#af5f00255&|$+0#e000e06&|1| +0#0000000&@50
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@8|p+0#af5f00255&|r|i|n|t|f| +0#0000000&|'+0#af5f00255&|%+0#e000002&|s|'+0#af5f00255&| +0#0000000&|"+0#af5f00255&|$+0#e000e06&|{|||v|a|l|s|u|b|f|u|n|c| |t|w|e|l|v|e| @6|}|"+0#af5f00255&| +0#0000000&@24
@8|u+0#00e0e07&|n|l|u|c|k|y|=+0#0000000&|$+0#e000e06&|{|||v|a|l|s|u|b|f|u|n|c| |t|h|i|r|t|e@1|n| +0#0000000&@36
@57|1|9|,|1| @9|4|3|%|

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@ -0,0 +1,20 @@
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|}+0#e000e06&| +0#0000000&@73
@8|t+0#af5f00255&|y|p|e|s|e|t| +0#0000000&|n+0#00e0e07&|o|t|a|f|l|o|a|t|=+0#0000000&|$+0#e000e06&|{|||v|a|l|s|u|b|f|u|n|c| |n|o|t|a|n|u|m|b|e|r| @5|}| +0#0000000&@17
@8|p+0#af5f00255&|r|i|n|t| +0#e000002&|$+0#e000e06&|u|n|l|u|c|k|y| +0#e000002&|$+0#e000e06&|n|o|t|a|n|u|m|b|e|r| +0#0000000&@40
@8|$+0#e000e06&|{|||e+0#af5f00255&|c|h|o| +0#e000002&|f|o@1|}+0#e000e06&| +0#0000000&@54
@8>$+0#e000e06&|{|||e+0#af5f00255&|c|h|o| +0#e000002&|b|a|r| +0#0000000&@55
|}+0#e000e06&| +0#0000000&@73
|f+0#af5f00255&|i| +0#0000000&@72
@75
|#+0#0000e05&| |=@5| +0#0000000&@66
|#+0#0000e05&| |S|h|a|r|e|d|-|s|t|a|t|e| |c|o|m@1|a|n|d| |s|u|b|s|t|i|t|u|t|i|o|n|s| |u|s|i|n|g| |t|h|e| |s|y|n|t|a|x| |$|{|<|f|i|l|e|;|}| +0#0000000&@11
|#+0#0000e05&| |a|r|e| |o|n|l|y| |s|u|p@1|o|r|t|e|d| |b|y| |k|s|h|9|3|,| |n|o|t| |m|k|s|h|.| +0#0000000&@34
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|}+0#e000e06&| +0#e000002&|>+0#af5f00255&| +0#0000000&|/|t|m|p|/|s|t|r|f|i|l|e| @58
|e+0#af5f00255&|c|h|o| +0#e000002&|$+0#e000e06&|{|<+0#af5f00255&|/+0#e000e06&|t|m|p|/|s|t|r|f|i|l|e|;|}| +0#0000000&@52
@75
|e+0#af5f00255&|x|i|t| +0#0000000&|0+0#e000002&| +0#0000000&@68
|~+0#4040ff13&| @73
| +0#0000000&@56|3|7|,|2|-|9| @7|B|o|t|

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| +0&#ffffff0@7|p+0#af5f00255&|r|i|n|t|f| +0#0000000&|'+0#af5f00255&|%+0#e000002&|s|'+0#af5f00255&| +0#0000000&|"+0#af5f00255&|$+0#e000e06&|{|||v|a|l|s|u|b|f|u|n|c| |t|w|e|l|v|e| @6|}|"+0#af5f00255&| +0#0000000&@24
@8|u+0#00e0e07&|n|l|u|c|k|y|=+0#0000000&|$+0#e000e06&|{|||v|a|l|s|u|b|f|u|n|c| |t|h|i|r|t|e@1|n| +0#0000000&@36
|}+0#e000e06&| +0#0000000&@73
@8|t+0#af5f00255&|y|p|e|s|e|t| +0#0000000&|n+0#00e0e07&|o|t|a|f|l|o|a|t|=+0#0000000&|$+0#e000e06&|{|||v|a|l|s|u|b|f|u|n|c| |n|o|t|a|n|u|m|b|e|r| @5|}| +0#0000000&@17
@8|p+0#af5f00255&|r|i|n|t| +0#e000002&|$+0#e000e06&|u|n|l|u|c|k|y| +0#e000002&|$+0#e000e06&|n|o|t|a|n|u|m|b|e|r| +0#0000000&@40
@8|$+0#e000e06&|{|||e+0#af5f00255&|c|h|o| +0#e000002&|f|o@1|}+0#e000e06&| +0#0000000&@54
@8|$+0#e000e06&|{|||e+0#af5f00255&|c|h|o| +0#e000002&|b|a|r| +0#0000000&@55
|}+0#e000e06&| +0#0000000&@73
|f+0#af5f00255&|i| +0#0000000&@72
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|#+0#0000e05&| |=@5| +0#0000000&@66
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|e+0#af5f00255&|c|h|o| +0#e000002&|$+0#e000e06&|{|<+0#af5f00255&|/+0#e000e06&|t|m|p|/|s|t|r|f|i|l|e|;|}| +0#0000000&@52
@75
>e+0#af5f00255&|x|i|t| +0#0000000&|0+0#e000002&| +0#0000000&@68
@57|4|9|,|1| @9|B|o|t|

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#!/bin/ksh
# This script is a test file for ksh93 shared-state
# command substitutions (subshares) and mksh value
# substitutions (valsubs).
# ======
# Below is subshare syntax supported by both ksh93 and mksh.
print ${ echo one }
print ${ echo two
}
print ${
echo three }
print ${ echo 'four'; }
print ${ echo 'five' ;}
print ${ echo 'six'
}
print ${ echo 'seven' }
echo ${ print 'eight' }
typeset nine=${ pwd; }
# ======
# Value substitutions of the form ${|command} are only
# supported by mksh, not ksh93.
if ! command eval '((.sh.version >= 20070703))' 2>/dev/null; then
valsubfunc() {
REPLY=$1
}
echo ${|valsubfunc ten}
print "${|valsubfunc eleven;}"
printf '%s' "${|valsubfunc twelve }"
unlucky=${|valsubfunc thirteen
}
typeset notafloat=${|valsubfunc notanumber }
print $unlucky $notanumber
${|echo foo}
${|echo bar
}
fi
# ======
# Shared-state command substitutions using the syntax ${<file;}
# are only supported by ksh93, not mksh.
echo ${
printf %s str
} > /tmp/strfile
echo ${</tmp/strfile;}
exit 0