Explore variables using the env and the set commands. • Create a new variable named hrs_worked. Assign hrs_worked a value of 20. • Create a new variable named hrly_rate. Assign hrly_rate a value of 38. • Create another variable named pay and assign it the value of hrs_worked times hrly rate. • export all 3 variables. • Set hrly rate to readonly. Try to unset hrly rate. • Use the echo command to see the values of all 3 variables • TO HAND IN: Take a screen shot of these commands for PART 1. PART 2: Experiment with creating aliases to make your use of UNIX a little easier: • Create 3 aliases using the alias command to make useful shortcut commands. • unalias one of those assignments. • TO HAND IN: Take a screen shot of these alias assignments plus their execution for PART 2