Write a gawk program that numbers each line in a file and sends its output to standard output.

Write a gawk program that displays the number of characters in the first field followed by the first field and sends its output to standard output.

Write a gawk program that uses the cars file (page 645), displays all cars priced at more than $5,000, and sends its output to standard output.

Use gawk to determine how many lines in /etc/services contain the string Mail. Verify your answer using grep.