What Does F7 Do?

This is probably the best-kept secret in command consoles. Every time I show this to someone, they say they had no idea it was available. If you have been entering several commands in a console screen, pressing the F7 function key displays a menu of the previously executed commands, as Figure 2.2 shows.

Figure 2.2. Pressing the F7 function key presents a command history menu.

Use the arrow keys to change the selection in the menu. Pressing Enter executes the command selected. Pressing F9 on the menu enables you to enter the command number you want to re-execute but only places it on the line (the command is not executed automatically).