# terminal-notifier > Send macOS User Notifications. > More information: . - Send a notification (only the message is required): `terminal-notifier -group {{tldr-info}} -title {{TLDR}} -message '{{TLDR rocks}}'` - Display piped data with a sound: `echo '{{Piped Message Data!}}' | terminal-notifier -sound {{default}}` - Open a URL when the notification is clicked: `terminal-notifier -message '{{Check your Apple stock!}}' -open '{{http://finance.yahoo.com/q?s=AAPL}}'` - Open an app when the notification is clicked: `terminal-notifier -message '{{Imported 42 contacts.}}' -activate {{com.apple.AddressBook}}`