Using Sudo in Ubuntu

The root user in Linux is the user which has administrative access to your system. Normal users do not have this access for security reasons. However, Ubuntu does not include the root user. Instead, administrative access is given to individual users, who may use the "sudo" application to perform administrative tasks.

When you run an application that requires root privileges, sudo will ask you to input your normal user password. This ensures that rogue applications cannot damage your system, and serves as a reminder that you are about to perform administrative actions which require you to be careful!

To use sudo when using the command line, simply type "sudo" before the command you wish to run. Sudo will then prompt you for your password.

Sudo will remember your password for a set amount of time. This feature was designed to allow users to perform multiple administrative tasks without being asked for a password each time.

Note: Be careful when doing administrative tasks, you might damage your system!

Usage

When using sudo, your password is stored by default for 15 minutes. After that time, you will need to enter your password again.
Your password will not be shown on the screen as you type it, not even as a row of stars (******). It is being entered with each keystroke!