SRCDS Controller as the name suggests is a shell script that controls the SRCDS server processes of qtland servers. There are two versions of the SRCDS Controller. There are tf (Team Fortress 2) and csgo (Counter-Strike: Global Offensive Legacy).
You can modify this shell script to your needs and works with any type of Source Engine server.
You need the latest version of node.js and npm with pm2 globally installed. It is always considered a security risk if you run SRCDS Controller under a user that has root permissions and isn't recommended.
You also need to generate the correct configuration files found within the game folders. Failure to do so makes the shell script not work.