Define command line history and describe its usage.

Question

What will be an ideal response?

Answer 1

Often, you find yourself entering the same command several times within a short period of time. Most shells keep a list of your recently used commands and allow you to recall a command without retyping it. You can access the command history with the up and down arrow keys. Pressing the up arrow key once recalls the most recently used command. Pressing the up arrow key twice recalls the second most recently used command. Each time you press the up arrow key, you recall an older command. Each time you press the down arrow key, you scroll forward in the command history. When you locate the command you want to execute, press Enter. This capability can save time and frustration when you need to enter the same or similar commands in one session.