For example, the Terminal application exists in the ‘x-terminal-emulator’ class. Using the update-alternatives command at the Terminal can change any application default where another application exists for the same ‘class’ of application. For example, my Terminal application of choice is terminator which is the default ‘alternative’, but what if I wanted to change it back to the original default of gnome-terminal? The update-alternatives tool The folder /etc/alternatives contains all of the ‘alternative’ applications for a particular type of application.
How I got my job in Linux: from Newbie to ProĮver wondered how your Linux system chooses the default Terminal Emulator, web browser, window manager, text editor, particular version of an app (eg, php5 vs 7/python2.7 vs 3)? Wonder no more! Change the default app in /etc/alternatives. How to install Ubuntu 18.10 on a Macbook Pro. How to install Linux on a Macintosh and dual boot with macOS. Moving to Linux? Bring your Google Drive with you. How to use Google Drive, OneDrive, Dropbox, Amazon S3 and more in Linux. Howto: What is Git and Github? How do I use it and why should I care?. Analysing system performance with ‘Top’. Files, Directories and the Linux Filing System. Chapter 3: Choosing a Linux Distribution. 
Chapter 2: Why Linux – What’s the Benefits?.
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