Wizard Boot Camp, Part Six: Daemons & Subshells | Linux Magazine

Let’s continue our discussion of Linux processes with a look at two unrelated concepts that are both good to understand. First we’ll write a simple daemon process and send signals to it. Then we’ll see how to suspend a child shell — which gives some insight into how shells cope with signals sent to them.

Here is a good article on processes and signals on a Unix/Linux system. This also shows why sending a ‘kill -9′ to terminate a normal process is a bad idea. It doesn’t give the process a chance to clean up after itself.

Wizard Boot Camp, Part Five: Control Processes Using Signals | Linux Magazine

This month we’ll dig into process control: signals sent to processes and how a shell handles processes, including some details on job control.