Starting the Notify Package

Unlike other applications we developed, notify won’t be an executable application. It will be a library that allows us to include system notifications in other applications. We’ll develop a naive but functional implementation that uses the os/exec package to call external programs that send a system notification. Because notifications vary according to the operating system, this is a practical example of how to use operating system–specific data and files in our applications.

Updating the notify.go file

Let’s update the file notify.go. We add the package definition and the import section. For this file, we’ll use:

• The package runtime to check the running operating system.
• The