Shell Scripting Tutorial-51: Nested Loops

In this tutorial you’ll learn to use nested loops to print all possible combinations of digits 1, 2 and 3.

I was asked to write this program in an exam I wrote in the second year of my graduation. I remember using three ‘for loops’ then. I got back home and immediately tested the code I wrote in the answer sheet and when I saw the twenty seven numbers on screen, I realized that I wasn’t as dumb as I thought myself to be.