The following tools will help you perform such tasks as searching the online documentation, switching user IDs, and controlling how programs run.
Locates commands by keyword.
Clears the screen.
Serves as a reverse-polish arbitrary precision calculator.
Gets information on a command.
Changes a job's priority.
Keeps a job running even if you log out.
Changes your password.
Produces a transcript of your login session.
Allows you to become the superuser. Since the root account is disabled by default, you should use sudo instead.
Executes a command as another user. This tool is usually used to temporarily gain superuser privileges.