how do i change the current prompt in shell?
 

I just want to change the current frame with my name, what is the code?
e.g.
fahrisal@linux:~> ..code...
prospekrisal:~>

and how to go back to the previous prompt?
e.g.
prospekrisal:~> ..code..
fahrisal@linux:~>

I've just solved the probllem. But now, how to return back?

To change it just run:
PS1="prospekrisal:~>"

You may want to store your old prompt in a temporary variable - ie:
OLDPS1=$PS1
PS1="prospekrisal:~>"

Then revert with:
PS1=$OLDPS1

You might also want to see:
http://www.linuxquestions.org/questi...d.php?t=115354

how to revert that code?

Just set PS1 to whatever you want it to be. If you logout and in again it should just go back to the default.