Advanced Exercises

Your company's current mail server runs on a commercial UNIX server, and you are planning to migrate it to Linux. After copying the configuration files across to the Linux system, you find that it does not work. What might you have forgotten to change?

Assume you have a script that sends its output to standard output. How would you modify the script to send the output in an email to a user specified by the first argument on the command line? (You may assume that the data is stored in $RESULT.)

Give a simple way of reading your email that does not involve the use of an MUA.

If you accidentally delete the /etc/aliases file, how could you easily re-create it (assuming that you had not restarted sendmail)?