There is a CW answer on how to set the PATH on Windows, but as far as I've seen there's none for any Unix/Linux or even OS X.
So should we have a Community Q/A for this topic, possibly covering all major operating systems?
I've never done that here, still a bit new to the whole system, so I'm waiting for any input. (Or should I just go ahead and ask with the community-faq-proposed tag?)
Just a few questions/answers on that topic I found: