Stylelint on the command line
Stylelint, the pluggable stylesheet checker (and fixer), is often integrated into an editor like Atom or Vim for convenience, via plugins like Atom’s linter-stylelint or Vim’s “ALE”.
But you can also run it on a one-off basis on any stylesheets like this:
# if npm-installed to the project, locally
npx stylelint --fix geese.scss
# if installed globally
stylelint --fix beefin.scss