Removes the environment variable variable from the environment of processes launched from this launcher.
On UNIX, the variable's name can be an arbitrary byte string not containing '='. On Windows, it should be in UTF-8.
the environment variable to unset, must not contain '='
2.40
Removes the environment variable variable from the environment of processes launched from this launcher.
On UNIX, the variable's name can be an arbitrary byte string not containing '='. On Windows, it should be in UTF-8.