You need Vim to do the exercises:
The OS ships with Vim by default, but it's a hopelessly outdated version.
$ sudo port install vim +huge
If you want a GUI, have a look at MacVim instead.
Ubuntu / Debian
Install a full-fledged Vim with GUI support (
C:\> choco install vim
Or download and install directly from here.
If you want to compile the latest Vim yourself, check out the official repository on GitHub.
Help us explain this better! File a GitHub issue at https://github.com/exercism/vimscript/issues if you have suggestions, or submit a patch with improvements to the https://github.com/exercism/vimscript/blob/master/docs/INSTALLATION.md file.