Ok, I found my notes.
Head to this website, and download the "rar" package for Mac OS (6.02 is the most recent version, I believe. However, I have been using 5.91). Note, this isn't WinRar for mac OS X, it is the basic "rar"
https://www.rarlab.com/download.htmDownload it, and extract the file into a convenient location. Then, these are the instructions I use:
Extracting a RAR file:
1. Open Terminal App
2. Type “cd(space)“, then drag into the terminal window the folder you would like to be extracted to.
3. Drag in the “UNRAR” executable file, then type “x(space)”, then drag in the file you would like to unrar.
4. Files will appear in the folder you put during the “cd” step.
Creating a RAR file
1. Open Terminal app
2. Type “cd(space)”, then drag in the folder that contains the files you want to rar, hit “enter”
3. Drag in the “RAR” executable file to the terminal window, then type “a(space)-r”, then another (space), then type the name you want the archive to have when it is created. Then hit “enter”
4. The file will appear in the folder you put in during the “cd” step.
Basically, the folder contains the two executables to Rar or Unrar an archive, and to run those, you can just drag the executable into the terminal window. "cd" moves terminal to the folder you want to work in. The x command is the command to unrar something. The A is to create a rar file, and the -r makes sure to include all subfolders and subfiles. Easy peasy!
This is a trial application, but it is not restricted as far as I know for these two uses. However, to continue to use it you should buy a license ($29). I have bought a license, as it helps them to keep supporting it!