I am working on MSP430F5438A. I want to send serial data via uart and plot it in real time. Please tell me how to do this using this software

Which application are you trying to use in particular? It sounds like you might be interested in Konsole, although i'm not sure how able it is to handle serial connections directly.

I am assuming that you are sending the data from your MSP430 micro controller to your Linux PC using serial communication.Most modern PC's /Laptops do not have any serial ports so for communicating between your PC and micro controller and PC ,you should use an USB to Serial converter.To transmit and receive data from your PC using serial port you can either use C language or Python.

You can check this article for identifying serial ports and programming your serial port using C language.
http://xanthium.in/Serial-Port-Programming-on-Linux

In case you want to use python
http://xanthium.in/Cross-Platform-seria ... d-PySerial