Most Useful and handy Linux / Unix commands

pwd

It Prints the working directory, i.e., display the name of my current directory on the screen.

hostname

It Prints the name of the local host (the machine on which I am working). Use netconf (as root) to change the name of the machine.

whoami

Print my login name.

Make linux terminal shortcodes

In Linux terminal Alias helps you to create shortcuts command, suppose if i need to display a list of directory with it's permission and group, that time i enter the command ll instead of ls -l, which will list the directory, ll is not a command in the Linux terminal but it's a alias defined in the system,

Enable skype notification icon/indicator in Ubuntu 12.04/13.04

After installing Skype on ubuntu 12.04 or 13.04, unity unable to Display the notification icon. (Download Skype for Linux)