4. The history list allows you to recall previous commands.

a. Type history. How many commands are in your list?

b. To recall the most recent instruction, type !!. Type this. What happens? Why?

c. To recall a previous instruction, type !# where # is the number in the list. For instance, type!1. Whathappened? Why? Type!nwherenisthenumberoftheinstructionprior to the history command (this should correspond to the man instruction from step

3). What happened? d. You can also type !str where str is a string of the beginning of the command. Type !m. This should recall your last man command. Type !p and it should recall your last ps command (from 2c). Type !ho. What command is executed? To execute this, why did you use !ho instead of !h? e. Type history again. How much longer is your list now than it was in step 4a?