Sending a Message
Messages can be sent in many ways in an office or a home environment — text message, e-mail, and even making a phone call. One method, not commonly used any more, is sending a message directly to a fellow system user's terminal. Because this technique is largely unknown, it can be fun to communicate with someone with this method.
This shell script utility helps you to quickly and easily send a message to someone who is logged onto your Linux system. It is a rather simple script, but it can be loads of fun!
Understanding the required functions
For this simple script, only a few functions are required. Several of the commands are common and have been covered in the book. However, a few of the commands have only been touched on, and you may not be familiar with the primary command needed. This section looks at the commands needed to put together this simple, but interesting script.
Determining who is on the system
The first utility needed is the who command...