It has been a really long time since I last wrote something here as life happens, things get busier, etc etc. I am now trying to get back into writing things down and here we go! So, imagine a tool or a service that allows you to run some arbitrary code via a shell. Either through a ssh or more commonly, via a web terminal. How does these tools isolate your code from other people’s code and vice versa ? How come you cannot see other people code or processes ?