How to make a CMD in Visual Basic

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Visual-Studio

hey guys,

i have been trying to make a programming language for a while now and i am going pretty well, i have made my own programming language. But i cant do some operations that i need for a console application because i dont know the commands to make that heppen. i then thought about my own operating system(yes, i am only 14 and building my own operating system) and then i though "hang on, if i am going to make my own operating system, why am i using the windows console applications? that is just using windows to make it."(please dont comment on why i am making an operating system in visual basic please). so i then thought "why dont i make my own cmd for my own operating system?" but i dont exactly know howt o make it. this is my code at the moment

for each a as string in textbox1.text.split(system.environment.newline())
     if a.contains("print ")
          textbox2.text = & system.environment.newline() & a.substring(6)
     end if
next

lets say you would type in:

print hello world
print something

the result would only be something. when it prints the second line, it clears the box after it prints the first line. i dont get what i am doing wrong, could you please tell me.