Experiment with pgawk (available only with gawk). What does it do? How can it be useful?

Write a gawk (not awk or mawk) program named net_list that reads from the rfc-retrieval.txt file on www.rfc-editor.org (see Getting Input from a Network on page 666) and displays a the last word on each line in all uppercase letters.

Expand the net_list program developed in Exercise 6 to use to_upper (page 665) as a coprocess to display the list of cars with only the make of the cars in uppercase. The model and subsequent fields on each line should appear as they do in the cars file.