What happens when KWin environment variable is not set?
When this variable is set, KWin will not allow remote access, which means no screen sharing or remote desktop. This environment variable is supported since 5.13. Not yielding can cause quite some CPU overhead, so on systems that do NOT provide triple buffering, V’Sync will be turned off except for __GL_YIELD=USLEEP
Where do I set the default environment variable in Linux?
If you use the “official” distribution, then it defaults to /usr/local/go, so if you unpack the distribution into that directory, you don’t have to set it. Linux distributions usually customize that default to wherever they package Golang files, in Manjaro’s case, the more sensible /usr/lib/go.
What to do with a Wayland environment variable?
On Wayland set this variable to directly use a software rendered mouse cursor instead of trying to probe for a cursor plane.
How to properly set environment variables ( Golang )?
(Of course, if you do set $GOBIN then use PATH=$PATH:$GOBIN instead.) Regarding not having the Golang environment variables set, these days you don’t need them for most cases. The $GOROOT variable points at where the Golang installation was unpacked.
Is it possible to set an environment variable at runtime from Java?
Yes, through ProcessBuilder when spawning the process. If the process has already been spawned when the environment alteration is required, you need method 2 above (or some equally convoluted method, such as code-injection at spawn time, ulteriorly controlled through e.g. socket by the parent process.)
How to change the environment of a process?
As Greg Hewgill pointed out, to change the current process’ environment you can call setenv or its platform-specific equivalent via JNI. You may also employ the extremely convoluted method from point 2 below, which works for any process (provided you have the permissions.)