You can also use links:
sudo ln /usr/games/prboom-plus usr/bin/prboom-plusIf you don't want to use links but you want to add that directory to your path instead, you can do this:
export PATH=$PATH:/usr/local/games/ For me, the best solution is to use a text editor on "/home/YOUR_USER_NAME/.bashrc" (emacs, nano...) and copy-paste"export PATH=$PATH:/usr/local/games/" in the last line of the file. After that, the enviroment variable will have added the desired directory.
