Basic Commands in Linux

To work in a Linux command, The user should select 'Terminal' mode.
(open: CLT+ALT+F1 close: CLT+ALT+F7)

In Linux # indicates admin(root) user and $ indicates the default/normal user.

• $logname : This command display the current username.

• $pwd : This command display the present working directory.

• $clear : This command clears the screen.

• $logout : This command logout used from the current user.

• $date : This command displays date and time.

• $who am i : This command use to display current username, terminal number, date and time at which you logged in the system.

• $who : This commnad display information about all users who logged into the system.

i.e each username, ternimal number, date and time at which the users logged into the system.

• $finger : It displays complete information about all users who logged into the system.

• $cal : This command display previous/current calender.

$cal year 

usage : $cal 2013

$cal month year

usage: $cal 3 2012

• $init : This command is use to change the system behaviour at run level.

#init 1 : This command bring the system to single usermode.
#init 2 : This command brings the system to multi usermode.
#init 3 : This command brings the system to multiuser mode with resource shared.
#init 6 : This command hunts and reboot the system to default run level.