$ arc linters
[snip]
 AVAILABLE   ruby (Ruby)
 CONFIGURED  rubocop (Ruby static code analyzer)
 AVAILABLE   script-and-regex (Script and Regex)
[snip]
(Run `arc linters --verbose` for more details.)

$ arc lint --amend-all file.rb

>>> Lint for file.rb:


   Warning  (Style/StringLiterals) RuboCop
    Prefer single-quoted strings when you don't need string interpolation or
    special symbols.

[snip]
    >>>        4   describe "invitation" do
[snip]