For those who are afraid of the terminal, there is away to learn many things about it. The easiest is by opening terminal by going to Applications -> Utilities -> Terminal and then typing man ‘command’. Where ‘command’ is the name of the command. Man is short for manual
For instance, typing ‘man man’ without the quotes will show the online-manual for the online-manual command ‘man’. Here are some commands to experiment and learn more about terminal. Don’t forget to put ‘man’ in front of these.
builtin – This is the holy grail of built in shell commands within terminal.