What output do you refer to?  How are you generating the output?  We're not in a position to know unless you post some code.

Anyway - if you're using print() then try println() (which is documented in the Reference); though since Processing is running on Java you can also use \n:

print("foo\nbar");

If that doesn't answer the question then post the code ;)

not sure what it has to do with shapes...
but simply using println(); instead of print(), outputs a new line to the console.

I need the output in display window (& not in console) so i guess println wouldn't work.

For example an output of this sort but using the new-line command.(so whats the new-line cmd in Processing how to use it  ?)

*
*  *
*  *  *
*  *   *  *

Why not read people's responses properly (i.e. post some code!), or simply try things (like '\n') out yourself:

1. void setup() {
2.   size(200,200);
3.   PFont font = createFont("Arial",18);
4.   textFont(font);
5.   text("foo\nbar\nnew line...",10,20);
6.   noLoop();
7. }

depening on what you want to do ( we still dont know) it makes sense to use translate() in a loop...