The history order is utilized to see the recently executed order. This feature was not accessible in the Bourne shell. bash and Korn support this element where each order executed is treated as the occasion and is related to an occasion number utilizing which they can be reviewed and changed whenever required. These orders are spared in a historical document. In Bash shell history order shows the entire rundown of the order. Order history is a component in many working framework shells, PC variable based math programs, and other programming that permits the client to review, alter and rerun past orders.