1. Write an awk program that displays the names of people who were born on the 10th day of the month
2. Write an awk program that displays the names and birth dates of the people in the sales department. Display the birth dates without the year (mm/dd).
3. Write a shell script to take two numbers as arguments and output their sum using expr. Include error checking to test whether two arguments were entered.
4. Modify the shell script above in 3 to interactively take the two numbers as arguments.