Did you run into any issues?
I did run into an issue when I was updating the Ruby software. I googled the problem, and found that it is a common issue
when updating and installing dev tools on the Mac, particularly some of the Xcode tools. I was able to install everything
after that.

How do you open Atom from your Terminal?
Simply type "atom".

What is the file extension for a Ruby file?
.rb

What is the Atom shortcut for hiding/ showing your file tree view?
Command \

What is the Atom shortcut for quickly finding a file (fuzzy finder)?
command p

What does pwd stand for, and how is this command helpful?
In Unix and Linux-based systems, PWD stands for Present Working Directory. This command is useful for finding out where in the
file tree the user is currently.

What does ls do? What about cd and mkdir?
The ls command displays a list of files in the directory. cd changes the directory, and mkdir creates a directory/

What does hostname tell you, and what shows up in YOUR terminal when you type hostname?
hostname tells you what your computer is called on the network, so you can use that name instead of IP addresses.
Eliots-MBP.domain

Type the following commands into your Terminal to ensure you have Ruby, rbenv and Git installed. Take a screenshot that shows the versions of each of these, and post it as a comment in your Gist:
which ruby
git --version
rbenv --version


/usr/bin/ruby
git version 2.15.0
rbenv 1.1.1