2. Create a shell script named add2 that asks the user to enter two whole num- bers, adds them, and reports the sum. You may assume that the user will enter only whole numeric arguments. 3. Create a shell script named addup that can take any number of numeric ar- guments, adds them, and reports the sum. You may assume that only nu- meric arguments will be given. If no arguments are given, addup should print a usage message