multiprocessing - Sample Multi Process applications in Linux -

We are working on a project in Linux, to show us the realities of some real-world multi-process applications Need to use.

I could not find any multi-process applications in Linux.

Please help me with the names of such applications.

any shell pipeline:

  copy whatever myfile | Head -100   
 Use two processes (GRP and head) to show the first hundred lines of  in  which  myfile  is. This type of thing is the whole place in Linux, or any * niks-like system, more specifically, it is an important feature to implement Unix philosophy, and such as Bash, Corn Shell, Jade Shell, Dash, Sea Shell etc. Is central to any shell.  
 Linux is made of multiprocessing if you are still not convinced, then look at  sshd  which increases the process for each machine and accepts logins from other machines .