windows - CMD enviroment variables not expanded in PATH variable -


i've enviroment variables set in sistem preferences (windows 8.1). if start cmd.exe , execute commands:

c:\users\carlo>echo %grails_home% d:\grails  c:\users\carlo>echo %gradle_home% d:\gradle  c:\users\carlo>echo %groovy_home% d:\groovy  c:\users\carlo>echo %path% c:\programdata\oracle\java\javapath;c:\program files (x86)\intel\iclsclient\; c:\program files\intel\icls client\;c:\windows\system32;c:\windows; c:\windows\system32\wbem;c:\windows\system32\windowspowershell\v1.0\; c:\program files\intel\intel(r) management engine components\dal; c:\program files\intel\intel(r) management engine components\ipt; c:\program files (x86)\intel\intel(r) management engine components\dal; c:\program files (x86)\intel\intel(r) management engine components\ipt; c:\program files\intel\wifi\bin\;c:\program files\common files\intel\wirelesscommon\; c:\program files (x86)\brackets\command;%grails_home%\bin;%gradle_home%\bin; %groovy_home%\bin

why last 3 variables not expanded in path?

complete path variable is: 

c:\programdata\oracle\java\javapath;c:\program files (x86)\intel\icls client\;c:\program files\intel\icls client\;%systemroot%\system32;%systemroot%;%systemroot%\system32\wbem;%systemroot%\system32\windowspowershell\v1.0\;c:\program files\intel\intel(r) management engine components\dal;c:\program files\intel\intel(r) management engine components\ipt;c:\program files (x86)\intel\intel(r) management engine components\dal;c:\program files (x86)\intel\intel(r) management engine components\ipt;c:\program files\intel\wifi\bin\;c:\program files\common files\intel\wirelesscommon\;c:\program files (x86)\brackets\command;%grails_home%\bin;%gradle_home%\bin;%groovy_home%\bin

environment variables (envvars) name state: variables; have name , value (in windows value string).

so in example name path , value string listed. os (command interpreter) doesn't have idea semantics of envvar value when expands var name shows value. doesn't analyze value , recursively expand other variables may there.

if variables defined in other variables (something wouldn't recommend) consumer's job expand of them.

a common c function deals envvars (maybe help): expandenvironmentstrings


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