We can get different triggers for post notifications when certain events happen in iterm2.

When a a command finishes

(even if it’s chained with other commands):

Option 1: Manually integrate the notification in the command chain

myCommand && say "done"

Option 2: Enable alerts

Via cmd + alt + a or via Edit > Mark and Annoations > Alerts > Post Notifications and this is enough to have iterm2 post a notification to the system notifications engine when the flow of control has changed to another command.


When new output is detected

For this, iterm2 has a trigger configuration, which can do a lot more than just posting notifications.

For it, go to Session > Triggers > Add Trigger..., enter an all-accepting regular expression (.*), and set the action to Post notification.