What does dollar symbol mean in windows batch file language? -


i got following file setup environment tomcat:

if exist "%catalina_home%/jre${jdk.windows.version}/win" (     if not "%java_home%" == "" (         set java_home=     )      set "jre_home=%catalina_home%/jre${jdk.windows.version}/win" )  set "java_opts=%java_opts% -dfile.encoding=utf8 -djava.net.preferipv4stack=true -dorg.apache.catalina.loader.webappclassloader.enable_clear_references=false -duser.timezone=gmt -xms1g -xx:maxpermsize=256m"

what dollar sign , el-like variables mean here?

update 1

this code located in setenv.bat file, , called in catalina.bat normally

rem standard environment variables if not exist "%catalina_base%\bin\setenv.bat" goto checksetenvhome call "%catalina_base%\bin\setenv.bat" goto setenvdone :checksetenvhome if exist "%catalina_home%\bin\setenv.bat" call "%catalina_home%\bin\setenv.bat" :setenvdone

it looks jre${jdk.windows.version} being replaced install directory name - specific part not using windows batch commands. perhaps in tomcat's install routine.


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