Sams Teach Yourself Shell Programming in 24 Hours, Second Edition

Hour 7. Processes

In UNIX every program runs as a process. A process is an instance of running a program. If, for example, three people are running the same program simultaneously, there are three processes there, not just one. In this chapter you will learn about processes and jobs and the different modes in which they can be executed. You will also look at the commands used to list and terminate processes. Specifically the topics you will examine are:

• Starting processes

• Listing running processes

• Killing processes

• Manipulating parent and child processes