Very poor article in my opinion mentioning 3rd party applications most probably not available by default on linux boxes.
These are thrid-party programs that are unlikely to be installed on a Linux system by default:
https://github.com/raboof/nethogs
https://github.com/tmux/tmux/wiki
http://mama.indstate.edu/users/ice/tree/
http://invisible-island.net/dialog/dialog.html
Also, you should prefer "pgrep" to "pidof"; the former is available also on BSDs.