Find all Heroku apps with a given gem

heroku-apps-with-gem.md

# heroku-apps-with-gem.sh
apps=$(heroku apps | grep -E -v '(^===|^$)' | awk '{print $1}')

set -k

for app in $apps; do
  heroku run "cat Gemfile.lock | grep $1" -a $app --exit-code > /dev/null 2>&1

  if (( $? == 0)); then
    echo $app
  fi
done

$ ./heroku-apps-with-gem.sh rails

This is now https://github.com/hyperoslo/heroku-apps-with-gem