How do I write in textbox like terminal ?

Hello everyone

i need write in textbox or richtextbox like terminal in Linux

Exam:

The textbox start order like this
Order:~# Here write any Command i have in my code

if i write command does not exist and press enter like this

Order:~# print Ti
Command not found

Order:~#

if i write Print time in textbox and press enter like this:

Order:~# print time
Time 11:47 PM

Order:~# Print Date
Date 16/04/2013

Order:~#

Wait your help
Thank you very much