Shell command history stores previously entered commands for retrieval and execution. In a robot shell, the up and down keys revisit commands and can replay earlier movements. section 4.2
A basic shell keeps history only during the current session. Persistent history requires loading a history file at startup and saving it when the shell exits; Python's readline module supplies these operations. section 4.8
Replayable robot movements
A recorded sequence can contain commands such as spin_right, forward 0.2 1, and backward 0.5. Recalling these entries makes repeated movement testing quick and direct. section 4.2 section 4.8
spin_right spin_left right left forward 0.2 1 forward 0.2 3 backward 0.5 1 backward 0.5
Inspect a compact movement history containing turns, speed and duration arguments, and forward and backward commands. section 4.8
