Sudo which is su “do” allows a system administrator to delegate authority to give certain users (or groups of users) the ability to run some (or all) commands as root or another user while providing an audit trail of the commands and their arguments.sudo allows a permitted user to execute a command as the superuser or another user, as specified in the sudoers file.

Today, I did a fresh installation of Ubuntu 9.04 inside virtual box. My original idea was to play with sudoers and sudo command. I edited /etc/sudoers and logged out. Next time I tried to sudo , I go some parse error in /etc/sudoers. I was stuck . I needed sudo for modifying the file. But sudo was preventing me because of the error.

The file /etc/sudoers, has the rules that users have to follow when using sudo command.

But what if, as a system administrator, you add a new user and want to give them similar sudo rights? How do you go about doing this?

The consensus among new Unix and Linux users seems to be that sudo is more secure than using the root account, because it requires you type your password to perform potentially harmful actions. In reality, a compromised user account, which is no big deal normally, is instantly root in most setups.

Have you ever attempted to do something with a file on a Linux machine and been given the error "permission denied"? For some people this isn't a problem, either su to the root user or use the sudo command to help you along. For some users, however, this can be very frustrating.

A linux power user must know about the file compression utility tar. tar is used to store and extract files from and to an archive file. Mainly source codes distributed in tar format. Here some examples of tar usage

By default, the root account password is locked in Ubuntu - Canonical neither supports nor advocates enabling the root account. This means that you cannot login as root directly or use the su command to become the root user. However, since the root account physically exists it is still possible to run programs with root-level privileges.

User management on Fedora 15 is just as easy as on any other distribution or operating system. And the graphical user management tools (there are two) are very intuitive to use. There are two types of user accounts on Fedora 15 – Standard and Administrator. The Administrator has root or super user privileges. During installation, the user created may be added to the Administrators group.