UNIX hosts are typically reliable servers used to house databases, client/server applications, and Telnet/SSH sessions. They’re also awesome for running Web services in general.
UNIX services run through background programs called daemons. Some service problems can be solved by stopping and starting a daemon process. Others will require an examination of logs or configuration files to figure out what’s wrong.
You’ll often need to run commands as the root user. To get comfortable and become good at this, you’ll probably want to set up a test system, where you’re able to learn from your mistakes without affecting a crucial system.
You can keep track of the services and clients running on your system through the netstat command. A busy ...