How to Check the IP Address in Linux

No matter what build of Linux or Unix you are running, there are methods for checking your internal IP address from using a simple graphical interface to delving deeper into network information.

Use the Ubuntu Interface

 * 1) Right click the network icon in your notifications area. In most builds the icon is two vertical arrows pointing up and down, located near the date and time.
 * 2) * If your network icon is not displayed, you can add it back by right clicking the notification area, selecting "Add to Panel," and then "Network Manager".
 * 3) * If your network icon still won't display, navigate to System > Administration > Network Tools and select your network device from the drop down menu (usually "Ethernet Interface eth0"). The 10 digit number that displays is your IP address.
 * 4) Click Connection Information. This should open a window with information on your network connections, including your IP Address.

Read more...http://www.wikihow.com/Check-the-IP-Address-in-Linux