To know the ip address of the machine
$ifconfig
To view list of previously typed commands in command prompt
$history | grep <word that need to be searched>
To Know the ip address of the website
$host site-name
To list all the process running in a machine
$ps aux
To kill a process that is running
$kill -9 the process code
To know which process consumes more space
$top
To know how much space the folder occupies
$du -sh .
