"terminal-notifier is a command-line tool to send Mac OS X User Notifications, which are available in Mac OS X 10.8. It is currently packaged as an application bundle, because NSUserNotification does not work from a ‘Foundation tool’. radar://11956694 The Notification Center always uses the application’s own icon, there’s currently no way to specify a custom icon for a notification. The only way to use this tool with your own icon is to include a build of terminal-notifier with your icon instead. This tool will be used by Kicker to show the status of commands which are executed due to filesystem changes. (v3.0.0) Download Prebuilt binaries, which are code-signed and ready to use, are available from the downloads section. Or if you want to use this from Ruby, you can install it through RubyGems: $ [sudo] gem install terminal-notifier" #gems #notifications #cli #ruby #Mac #pub