If you like desktop reminder apps like the excellent Alarms.app but want to get all nerdy about it, you can use the Unix utility at() and Growl to set little reminders for yourself.
As the time and date for each reminder arrives, you'll see a Growl notification.
Here's how to do it:
$ sudo launchctl load -F /System/Library/LaunchDaemons/com.apple.atrun.plist
Note: You only need to do this once to enable at() to work.
Try your first reminder:
$ at 11:19 today > growlnotify -m "eat a doughnut" -w -s > (ctl-d)
At 11:19 today, you'll see a Growl notification that says, "eat a doughnut"
It's also useful to Google around for tips on using at(). For example, the time specifications are very flexible. You can do, for example:
... and so on.
To see all your scheduled reminders, type: atq
To remove a reminder, type: atrm [job id]
See also: man at
Tue Oct 12 11:31:18 PDT 2010