in Formula/ecctl.rb [19:26]
def caveats; <<~EOS
To get autocompletions working make sure to run "source <(ecctl generate completions)".
If you prefer to add to your shell interpreter configuration file run, for bash or zsh respectively:
* `echo "source <(ecctl generate completions)" >> ~/.bash_profile`
* `echo "source <(ecctl generate completions)" >> ~/.zshrc`.
EOS
end