This exercise is designed to get you familiar with the Ubuntu command-line editing features. It also introduces you to the concept of command-line history.

Follow these steps

1. Type the words "We all love Ubuntu" (without the quotation marks) but do not press Enter.
   
2. Press the left arrow key to move the cursor to the letter "a" in the word "all".
   
3. Press Alt+D to delete the word "all".
   
4. Re-type the word "all" at the present cursor position.
   
5. Press Ctrl+A to move the cursor to the beginning of the command line.
   
6. Press the right arrow key to move the cursor to the letter "l" in "love".
   
7. Press Ctrl+K to delete the line from the current cursor position.
   
8. Press Ctrl+A and then press Ctrl+K to delete the entire line.
   
9. Type "echo $SHELL" and press Enter.
   
10. Type "date" and press Enter.
    
11. Type "cal" and press Enter.
    
12. Press the up arrow three times. You should see "echo $SHELL" on the current command line. Press the down arrow once. The current line will show "date". Now press Enter.
    
13. Type "clear" and press Enter.