I think I know what happened. Did you do something like PATH="/usr/bin/golang"?

Because doing that overwrite your path variable. You need to set it like this:

PATH="{PATH}:/usr/bin/golang" to append to the path.

And well… I hope you got a backup of your /root/.bashrc or whatever you use as a terminal. Restoring it should fix it

Edit: you should be able to use any program by appending /usr/bin/ to your commands, as long as it’s in this directory

Oh no. This is so bad. Who in their right mind would assume that a login user remains the same user throughout the session!?

Oh wait. Windows.