LINUX HELP! Hi, I need help on #10. This is a linux course and I need to write a sed script that will do the following:

I don't understand what a sed script is. Does it have to be done in one command line? Please help me. Thanks, will rate.

Also, one of the 'solutions' that can be found on the internet does not work. If you answer with it, please explain how to use it, because it doesn't work.

10. Write a sed script that will: a. nsert above the first line the tile PERSONNEL FILE b. Remove the salaries ending in 500. c. Print the contents of the ile with the last names and frst names reversed. d. Append at the end of the file THE END