How can I access WIN system variables in WSL?

[FrankBergemann]

I have question on WSL bash shell usage on WIN10:
How can I access WIN system variables e.g. JAVA_HOME, MVN_HOME etc. in a WSL bash shell?
Is there some way to import all of them?
I even have trouble handling the blank between "Program" and "Files" in C:\Program Files\Java\jdk-11.0.4 when trying to set in JAVA_HOME in .profile manually.
Can anyone help?

[therealkenc]

WSLENV. You can also get them with:

$ JAVA_HOME=$(pushd /mnt/c > /dev/null; cmd.exe /c echo %JAVA_HOME%; popd > /dev/null)
$ echo "$JAVA_HOME"

As for undefined "handling the blank", you'll get better eyeballs on shell programming in stackoverflow and the like.