Steps will help you script long install processes in a way that is as controllable as if you were executing each individual command by hand.
For instance, when you follow a tutorial on how to setup a complex dev environment you end up following multiple steps and writing a bunch of commands. Now you can script that. Steps will log the commands ouput to a file giving each one a step number, allowing you to resume to a specific step when an error arise, even if it crashed your entire system.
Invoke ./steps for further usage instructions.
For instance, to install Emacs from source on Ubuntu 18.04:
./steps Ubuntu-a8.04/emacs.steps.sh