Sometimes I run really long tasks in Terminal.app.

I sometimes wait.

I sometimes go somewhere else and forgot that it was running.

It would be so cool to have Terminal.app use Notifications to let me know that it is done.

Well.

Thankfully, someone has done just that and it can be downloaded via homebrew.

To install, type :
$ brew install terminal-notifier

To use:
$ echo "I'm pretending to be a long running task" ; terminal-notifier -message 'All done!'

Thanks to the folks over at apple.stackexchange.com for listing out this cool utility.