Know the use of function keys with command prompt!

Function keys -- Does

>> F1 Pastes the last executed command (character by character)
>> F2 Pastes the last executed command (up to the entered character)
>> F3 Pastes the last executed command
>> F4 Deletes current prompt text up to the entered character
>> F5 Pastes recently executed commands (does not cycle)
>> F6 Pastes ^Z to the prompt
>> F7 Displays a selectable list of previously executed commands
>> F8 Pastes recently executed commands (cycles)
>> F9 Asks for the number of the command from the F7 list to paste

ref.