diff --git a/runtime/syntax/sh.vim b/runtime/syntax/sh.vim
index a8258d7..167300c 100644
--- a/runtime/syntax/sh.vim
+++ b/runtime/syntax/sh.vim
@@ -2,8 +2,8 @@
 " Language:		shell (sh) Korn shell (ksh) bash (sh)
 " Maintainer:		Charles E. Campbell  <NdrOchipS@PcampbellAfamily.Mbiz>
 " Previous Maintainer:	Lennart Schultz <Lennart.Schultz@ecmwf.int>
-" Last Change:		Mar 19, 2018
-" Version:		174
+" Last Change:		Jul 31, 2018
+" Version:		179
 " URL:		http://www.drchip.org/astronaut/vim/index.html#SYNTAX_SH
 " For options and settings, please use:      :help ft-sh-syntax
 " This file includes many ideas from Eric Brunet (eric.brunet@ens.fr)
@@ -126,17 +126,17 @@
 endif
 syn cluster shArithParenList	contains=shArithmetic,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
 syn cluster shArithList	contains=@shArithParenList,shParenError
-syn cluster shCaseEsacList	contains=shCaseStart,shCase,shCaseBar,shCaseIn,shComment,shDeref,shDerefSimple,shCaseCommandSub,shCaseExSingleQuote,shCaseSingleQuote,shCaseDoubleQuote,shCtrlSeq,@shErrorList,shStringSpecial,shCaseRange
-syn cluster shCaseList	contains=@shCommandSubList,shCaseEsac,shColon,shCommandSub,shComment,shDo,shEcho,shExpr,shFor,shHereDoc,shIf,shHereString,shRedir,shSetList,shSource,shStatement,shVariable,shCtrlSeq
-syn cluster shCommandSubList	contains=shAlias,shArithmetic,shCmdParenRegion,shCtrlSeq,shDeref,shDerefSimple,shDoubleQuote,shEcho,shEscape,shExDoubleQuote,shExpr,shExSingleQuote,shHereDoc,shNumber,shOperator,shOption,shPosnParm,shHereString,shRedir,shSingleQuote,shSpecial,shStatement,shSubSh,shTest,shVariable
+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,shDo,shEcho,shExpr,shFor,shForPP,shHereDoc,shIf,shHereString,shRedir,shSetList,shSource,shStatement,shVariable,shCtrlSeq
+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
-syn cluster shDblQuoteList	contains=shCommandSub,shDeref,shDerefSimple,shEscape,shPosnParm,shCtrlSeq,shSpecial
+syn cluster shDblQuoteList	contains=shArithmetic,shCommandSub,shCommandSubBQ,shDeref,shDerefSimple,shEscape,shPosnParm,shCtrlSeq,shSpecial,shSpecialDQ
 syn cluster shDerefList	contains=shDeref,shDerefSimple,shDerefVar,shDerefSpecial,shDerefWordError,shDerefPSR,shDerefPPS
 syn cluster shDerefVarList	contains=shDerefOff,shDerefOp,shDerefVarArray,shDerefOpError
-syn cluster shEchoList	contains=shArithmetic,shCommandSub,shDeref,shDerefSimple,shEscape,shExpr,shExSingleQuote,shExDoubleQuote,shSingleQuote,shDoubleQuote,shCtrlSeq,shEchoQuote
+syn cluster shEchoList	contains=shArithmetic,shCommandSub,shCommandSubBQ,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,shCommandSub,shComment,shDo,shEcho,shExpr,shFor,shHereDoc,shIf,shOption,shHereString,shRedir,shSetList,shSource,shStatement,shVariable,shOperator,shCtrlSeq
+syn cluster shFunctionList	contains=@shCommandSubList,shCaseEsac,shColon,shComment,shDo,shEcho,shExpr,shFor,shHereDoc,shIf,shOption,shHereString,shRedir,shSetList,shSource,shStatement,shVariable,shOperator,shCtrlSeq
 if exists("b:is_kornshell") || exists("b:is_bash")
  syn cluster shFunctionList	add=shRepeat
  syn cluster shFunctionList	add=shDblBrace,shDblParen
@@ -144,12 +144,12 @@
 syn cluster shHereBeginList	contains=@shCommandSubList
 syn cluster shHereList	contains=shBeginHere,shHerePayload
 syn cluster shHereListDQ	contains=shBeginHere,@shDblQuoteList,shHerePayload
-syn cluster shIdList	contains=shCommandSub,shWrapLineOperator,shSetOption,shDeref,shDerefSimple,shHereString,shRedir,shExSingleQuote,shExDoubleQuote,shSingleQuote,shDoubleQuote,shExpr,shCtrlSeq,shStringSpecial,shAtExpr
+syn cluster shIdList	contains=shCommandSub,shCommandSubBQ,shWrapLineOperator,shSetOption,shComment,shDeref,shDerefSimple,shHereString,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,shForPP,shIf,shOption,shSet,shTest,shTestOpr,shTouch
 syn cluster shPPSRightList	contains=shComment,shDeref,shDerefSimple,shEscape,shPosnParm
-syn cluster shSubShList	contains=@shCommandSubList,shCaseEsac,shColon,shCommandSub,shComment,shDo,shEcho,shExpr,shFor,shIf,shHereString,shRedir,shSetList,shSource,shStatement,shVariable,shCtrlSeq,shOperator
-syn cluster shTestList	contains=shCharClass,shCommandSub,shCtrlSeq,shDeref,shDerefSimple,shDoubleQuote,shExDoubleQuote,shExpr,shExSingleQuote,shNumber,shOperator,shSingleQuote,shTest,shTestOpr
+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=shCharClass,shCommandSub,shCommandSubBQ,shCtrlSeq,shDeref,shDerefSimple,shDoubleQuote,shSpecialDQ,shExDoubleQuote,shExpr,shExSingleQuote,shNumber,shOperator,shSingleQuote,shTest,shTestOpr
 syn cluster shNoZSList	contains=shSpecialNoZS
 
 " Echo: {{{1
@@ -262,14 +262,15 @@
 
 " Case: case...esac {{{1
 " ====
-syn match   shCaseBar	contained skipwhite "\(^\|[^\\]\)\(\\\\\)*\zs|"		nextgroup=shCase,shCaseStart,shCaseBar,shComment,shCaseExSingleQuote,shCaseSingleQuote,shCaseDoubleQuote
-syn match   shCaseStart	contained skipwhite skipnl "("			nextgroup=shCase,shCaseBar
+syn match shCaseBar	contained skipwhite "\(^\|[^\\]\)\(\\\\\)*\zs|"		nextgroup=shCase,shCaseStart,shCaseBar,shComment,shCaseExSingleQuote,shCaseSingleQuote,shCaseDoubleQuote
+syn match shCaseStart	contained skipwhite skipnl "("			nextgroup=shCase,shCaseBar
+syn match shCaseLabel	contained skipwhite	"\%(\\.\|[-a-zA-Z0-9_*.]\)\+"	contains=shCharClass
 if exists("b:is_bash")
- ShFoldIfDoFor syn region  shCase	contained skipwhite skipnl matchgroup=shSnglCase start="\%(\\.\|[^#$()'" \t]\)\{-}\zs)"  end=";;" end=";&" end=";;&" end="esac"me=s-1 contains=@shCaseList nextgroup=shCaseStart,shCase,shComment
-else
- ShFoldIfDoFor syn region  shCase	contained skipwhite skipnl matchgroup=shSnglCase start="\%(\\.\|[^#$()'" \t]\)\{-}\zs)"  end=";;" end="esac"me=s-1 contains=@shCaseList nextgroup=shCaseStart,shCase,shComment
+ ShFoldIfDoFor syn region	shCase	contained skipwhite skipnl matchgroup=shSnglCase start="\%(\\.\|[^#$()'" \t]\)\{-}\zs)"  end=";;" end=";&" end=";;&" end="esac"me=s-1	contains=@shCaseList	nextgroup=shCaseStart,shCase,shComment
+else                                                                                                                     
+ ShFoldIfDoFor syn region	shCase	contained skipwhite skipnl matchgroup=shSnglCase start="\%(\\.\|[^#$()'" \t]\)\{-}\zs)"  end=";;" end="esac"me=s-1		contains=@shCaseList	nextgroup=shCaseStart,shCase,shComment
 endif
-ShFoldIfDoFor syn region  shCaseEsac	matchgroup=shConditional start="\<case\>" end="\<esac\>"	contains=@shCaseEsacList
+ShFoldIfDoFor syn region	shCaseEsac	matchgroup=shConditional start="\<case\>" end="\<esac\>"	contains=@shCaseEsacList
 
 syn keyword shCaseIn	contained skipwhite skipnl in			nextgroup=shCase,shCaseStart,shCaseBar,shComment,shCaseExSingleQuote,shCaseSingleQuote,shCaseDoubleQuote
 if exists("b:is_bash")
@@ -289,8 +290,8 @@
 " Misc: {{{1
 "======
 syn match   shWrapLineOperator "\\$"
-syn region  shCommandSub   	start="`" skip="\\\\\|\\." end="`"	contains=@shCommandSubList
-syn match   shEscape	contained	'\%(^\)\@!\%(\\\\\)*\\.'
+syn region  shCommandSubBQ   	start="`" skip="\\\\\|\\." end="`"	contains=@shCommandSubList
+syn match   shEscape	contained	'\%(^\)\@!\%(\\\\\)*\\.'	nextgroup=shSingleQuote,shDoubleQuote,shComment
 
 " $() and $(()): {{{1
 " $(..) is not supported by sh (Bourne shell).  However, apparently
@@ -347,17 +348,19 @@
  syn region  shExSingleQuote	matchGroup=Error start=+\$'+ skip=+\\\\\|\\.+ end=+'+	contains=shStringSpecial
  syn region  shExDoubleQuote	matchGroup=Error start=+\$"+ skip=+\\\\\|\\.+ end=+"+	contains=shStringSpecial
 endif
-syn region  shSingleQuote	matchgroup=shQuote start=+'+ end=+'+		contains=@Spell	nextgroup=shSpecialStart
+syn region  shSingleQuote	matchgroup=shQuote start=+'+ end=+'+		contains=@Spell	nextgroup=shSpecialStart,shSpecialSQ
 syn region  shDoubleQuote	matchgroup=shQuote start=+\%(\%(\\\\\)*\\\)\@<!"+ skip=+\\"+ end=+"+	contains=@shDblQuoteList,shStringSpecial,@Spell	nextgroup=shSpecialStart
+syn region  shDoubleQuote	matchgroup=shQuote start=+"+ skip=+\\"+ end=+"+		contained contains=@shDblQuoteList,shStringSpecial,@Spell	nextgroup=shSpecialStart
 syn match   shStringSpecial	"[^[:print:] \t]"			contained
-syn match   shStringSpecial	"[^\\]\zs\%(\\\\\)*\\[\\"'`$()#]"
-syn match   shSpecial	"[^\\]\zs\%(\\\\\)*\\[\\"'`$()#]"		nextgroup=shBkslshSnglQuote,shBkslshDblQuote,@shNoZSList
+syn match   shStringSpecial	"[^\\]\zs\%(\\\\\)*\\[\\"'`$()#]"			nextgroup=shComment
+syn match   shSpecialSQ	"[^\\]\zs\%(\\\\\)*\\[\\"'`$()#]"		contained	nextgroup=shBkslshSnglQuote,@shNoZSList
+syn match   shSpecialDQ	"[^\\]\zs\%(\\\\\)*\\[\\"'`$()#]"		contained	nextgroup=shBkslshDblQuote,@shNoZSList
 syn match   shSpecialStart	"\%(\\\\\)*\\[\\"'`$()#]"			contained	nextgroup=shBkslshSnglQuote,shBkslshDblQuote,@shNoZSList
 syn match   shSpecial	"^\%(\\\\\)*\\[\\"'`$()#]"
 syn match   shSpecialNoZS	contained	"\%(\\\\\)*\\[\\"'`$()#]"
 syn match   shSpecialNxt	contained	"\\[\\"'`$()#]"
-syn region  shBkslshSnglQuote	contained	matchgroup=shQuote start=+'+ end=+'+	contains=@Spell
-syn region  shBkslshDblQuote	contained	matchgroup=shQuote start=+"+ skip=+\\"+ end=+"+	contains=@shDblQuoteList,shStringSpecial,@Spell
+syn region  shBkslshSnglQuote	contained	matchgroup=shQuote start=+'+ end=+'+	contains=@Spell	nextgroup=shSpecialStart
+syn region  shBkslshDblQuote	contained	matchgroup=shQuote start=+"+ skip=+\\"+ end=+"+	contains=@shDblQuoteList,shStringSpecial,@Spell	nextgroup=shSpecialStart
 
 " Comments: {{{1
 "==========
@@ -375,20 +378,21 @@
 " Here Documents: {{{1
 " =========================================
 ShFoldHereDoc syn region shHereDoc matchgroup=shHereDoc01 start="<<\s*\\\=\z([^ \t0-9|>]\+\)"		matchgroup=shHereDoc01 end="^\z1\s*$"	contains=@shDblQuoteList
-ShFoldHereDoc syn region shHereDoc matchgroup=shHereDoc02 start="<<\s*\"\z([^ \t0-9|>]\+\)\""		matchgroup=shHereDoc02 end="^\z1\s*$"
+ShFoldHereDoc syn region shHereDoc matchgroup=shHereDoc02 start="<<\s*\"\z([^ \t|>]\+\)\""		matchgroup=shHereDoc02 end="^\z1\s*$"
 ShFoldHereDoc syn region shHereDoc matchgroup=shHereDoc03 start="<<-\s*\z([^ \t0-9|>]\+\)"		matchgroup=shHereDoc03 end="^\s*\z1\s*$"	contains=@shDblQuoteList
-ShFoldHereDoc syn region shHereDoc matchgroup=shHereDoc04 start="<<-\s*'\z([^'0-9]\+\)'"		matchgroup=shHereDoc04 end="^\s*\z1\s*$"
-ShFoldHereDoc syn region shHereDoc matchgroup=shHereDoc05 start="<<\s*'\z([^'0-9]\+\)'"		matchgroup=shHereDoc05 end="^\z1\s*$"
-ShFoldHereDoc syn region shHereDoc matchgroup=shHereDoc06 start="<<-\s*\"\z([^ \t0-9|>]\+\)\""		matchgroup=shHereDoc06 end="^\s*\z1\s*$"
+ShFoldHereDoc syn region shHereDoc matchgroup=shHereDoc04 start="<<-\s*'\z([^']\+\)'"		matchgroup=shHereDoc04 end="^\s*\z1\s*$"
+ShFoldHereDoc syn region shHereDoc matchgroup=shHereDoc05 start="<<\s*'\z([^']\+\)'"		matchgroup=shHereDoc05 end="^\z1\s*$"
+ShFoldHereDoc syn region shHereDoc matchgroup=shHereDoc06 start="<<-\s*\"\z([^ \t|>]\+\)\""		matchgroup=shHereDoc06 end="^\s*\z1\s*$"
 ShFoldHereDoc syn region shHereDoc matchgroup=shHereDoc07 start="<<\s*\\\_$\_s*\z([^ \t0-9|>]\+\)"	matchgroup=shHereDoc07 end="^\z1\s*$"           contains=@shDblQuoteList
 ShFoldHereDoc syn region shHereDoc matchgroup=shHereDoc08 start="<<\s*\\\_$\_s*'\z([^ \t0-9|>]\+\)'"	matchgroup=shHereDoc08 end="^\z1\s*$"
 ShFoldHereDoc syn region shHereDoc matchgroup=shHereDoc09 start="<<\s*\\\_$\_s*\"\z([^ \t0-9|>]\+\)\""	matchgroup=shHereDoc09 end="^\z1\s*$"
 ShFoldHereDoc syn region shHereDoc matchgroup=shHereDoc10 start="<<-\s*\\\_$\_s*\z([^ \t0-9|>]\+\)"	matchgroup=shHereDoc10 end="^\s*\z1\s*$"
 ShFoldHereDoc syn region shHereDoc matchgroup=shHereDoc11 start="<<-\s*\\\_$\_s*\\\z([^ \t0-9|>]\+\)"	matchgroup=shHereDoc11 end="^\s*\z1\s*$"
-ShFoldHereDoc syn region shHereDoc matchgroup=shHereDoc12 start="<<-\s*\\\_$\_s*'\z([^ \t0-9|>]\+\)'"	matchgroup=shHereDoc12 end="^\s*\z1\s*$"
-ShFoldHereDoc syn region shHereDoc matchgroup=shHereDoc13 start="<<-\s*\\\_$\_s*\"\z([^ \t0-9|>]\+\)\""	matchgroup=shHereDoc13 end="^\s*\z1\s*$"
+ShFoldHereDoc syn region shHereDoc matchgroup=shHereDoc12 start="<<-\s*\\\_$\_s*'\z([^ \t|>]\+\)'"	matchgroup=shHereDoc12 end="^\s*\z1\s*$"
+ShFoldHereDoc syn region shHereDoc matchgroup=shHereDoc13 start="<<-\s*\\\_$\_s*\"\z([^ \t|>]\+\)\""	matchgroup=shHereDoc13 end="^\s*\z1\s*$"
 ShFoldHereDoc syn region shHereDoc matchgroup=shHereDoc14 start="<<\\\z([^ \t0-9|>]\+\)"		matchgroup=shHereDoc14 end="^\z1\s*$"
 ShFoldHereDoc syn region shHereDoc matchgroup=shHereDoc15 start="<<-\s*\\\z([^ \t0-9|>]\+\)"		matchgroup=shHereDoc15 end="^\s*\z1\s*$"
+ShFoldHereDoc syn region shHereDoc matchgroup=shHereDoc16 start="<<-\s*\\\z([^ \t0-9|>]\+\)"		matchgroup=shHereDoc15 end="^\s*\z1\s*$"
 
 " Here Strings: {{{1
 " =============
@@ -404,9 +408,11 @@
 syn match  shVarAssign	"="		contained	nextgroup=shCmdParenRegion,shPattern,shDeref,shDerefSimple,shDoubleQuote,shExDoubleQuote,shSingleQuote,shExSingleQuote
 syn region shAtExpr	contained	start="@(" end=")" contains=@shIdList
 if exists("b:is_bash")
+ syn match  shSet "^\s*set\ze\s*$"
  syn region shSetList oneline matchgroup=shSet start="\<\(declare\|typeset\|local\|export\|unset\)\>\ze[^/]" end="$"	matchgroup=shSetListDelim end="\ze[}|);&]" matchgroup=NONE end="\ze\s\+#\|="	contains=@shIdList
- syn region shSetList oneline matchgroup=shSet start="\<set\>\ze[^/]" end="\ze[;|)]\|$"			matchgroup=shSetListDelim end="\ze[}|);&]" matchgroup=NONE end="\ze\s\+="	contains=@shIdList
+ syn region shSetList oneline matchgroup=shSet start="\<set\>\ze[^/]" end="\ze[;|#)]\|$"			matchgroup=shSetListDelim end="\ze[}|);&]" matchgroup=NONE end="\ze\s\+="	contains=@shIdList nextgroup=shComment
 elseif exists("b:is_kornshell") || exists("b:is_posix")
+ syn match  shSet "^\s*set\ze\s*$"
  syn region shSetList oneline matchgroup=shSet start="\<\(typeset\|export\|unset\)\>\ze[^/]" end="$"		matchgroup=shSetListDelim end="\ze[}|);&]" matchgroup=NONE end="\ze\s\+[#=]"	contains=@shIdList
  syn region shSetList oneline matchgroup=shSet start="\<set\>\ze[^/]" end="$"				matchgroup=shSetListDelim end="\ze[}|);&]" matchgroup=NONE end="\ze\s\+[#=]"	contains=@shIdList
 else
@@ -508,9 +514,9 @@
 if exists("b:is_bash")
  " bash : ${parameter:offset}
  " bash : ${parameter:offset:length}
- syn region shDerefOff	contained	start=':'	end='\ze:'	end='\ze}'	contains=shDeref,shDerefSimple,shDerefEscape	nextgroup=shDerefLen,shDeref,shDerefSimple
+ syn region shDerefOff	contained	start=':[^-=?+]' end='\ze:'	end='\ze}'	contains=shDeref,shDerefSimple,shDerefEscape	nextgroup=shDerefLen,shDeref,shDerefSimple
  syn region shDerefOff	contained	start=':\s-'	end='\ze:'	end='\ze}'	contains=shDeref,shDerefSimple,shDerefEscape	nextgroup=shDerefLen,shDeref,shDerefSimple
- syn match  shDerefLen	contained	":[^}]\+"	contains=shDeref,shDerefSimple
+ syn match  shDerefLen	contained	":[^}]\+"	contains=shDeref,shDerefSimple,shArithmetic
 
  " bash : ${parameter//pattern/string}
  " bash : ${parameter//pattern}
@@ -588,6 +594,8 @@
  hi def link shArithRegion	shShellVariables
  hi def link shAstQuote	shDoubleQuote
  hi def link shAtExpr	shSetList
+ hi def link shBkslshSnglQuote	shSingleQuote
+ hi def link shBkslshDblQuote	shDOubleQuote
  hi def link shBeginHere	shRedir
  hi def link shCaseBar	shConditional
  hi def link shCaseCommandSub	shCommandSub
@@ -680,6 +688,7 @@
  hi def link shCharClass		Identifier
  hi def link shSnglCase		Statement
  hi def link shCommandSub		Special
+ hi def link shCommandSubBQ		shCommandSub
  hi def link shComment		Comment
  hi def link shConditional		Conditional
  hi def link shCtrlSeq		Special
@@ -693,6 +702,8 @@
  hi def link shSetList		Identifier
  hi def link shShellVariables		PreProc
  hi def link shSpecial		Special
+ hi def link shSpecialDQ		Special
+ hi def link shSpecialSQ		Special
  hi def link shSpecialNoZS		shSpecial
  hi def link shStatement		Statement
  hi def link shString		String