When you enter commands in the Terminal, they are saved in a history that you can scroll through by pressing the up and down arrows. This is convenient because you can quickly access previously entered commands for repetitive tasks, or to access previously used syntax for a command. While this is useful, if you have entered the same command several times you will have to scroll through the same command in the terminal in order to get to a unique command you entered. This default behavior can be changed, which may be convenient for people who access the terminal frequently.
