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Showing posts from August, 2011

User accounts in Linux

Super User in Linux

Super User is the user with all rights for accessing all files, Like Windows Administrator. Here the super user is "root".

This user have all rights to access all files including system files. Should be careful if you are root. It can delete any files. So it may crash total system.

The root user can be created at the time of installation.


Adding User in Linux

The root user can add user to Linux box. Following command can be used for adding user in Linux.

[[email protected] ~]#useradd kumar

For setup password, Following command can be used,

[[email protected] ~]#passwd kumar
Changing password for user kumar.
New UNIX password:
Retype new UNIX password:
passwd: all authentication tokens updated successfully.

You'll get a warning message if you give any dictionary word.
"BAD PASSWORD: it is based on a dictionary word"

You can create user without password, also can disable password for a user. Passwordless account.

[[email protected] ~]#passwd -d kumar

Basic in Linux

Linux is one of the operation system. We can tell it as UNIX like operating system. It is open source, It come under GNU public license. We can use it as free. For more and updated details about Linux try Wikipedia.

Now we'll go for learning Linux throw command line, Before go administration these are some basics,

Terminal

The terminal is using for executing commends in Linux box. If we open terminal, it looks as bellow

[[email protected] ~]$

Here "kumar" is user account in Linux box. "LocalHost" is host name of your system, that means your system name. Normally till (~) symbol mention home directory of the logged user. If you are as root user , it looks as bellow

[[email protected] ~]#

Here you can see a difference in both things, that is dollar ($) symbol and Hash (#). There normal user have $ symbol at end and root user have # symbol at the end. This is easily to identify which user we have logged.

Executable commends in Linux are stored in /bin and /sbin direct…