I'm trying to create a cron that will run one time at a specific time.
For simplicity, how can I create a cron that will run at 11:57PM and print "Hello" to the screen then delete itself? (Cent OS 5)
If you need it to run just once, cron is not your tool.
(Press ctrl+d when done entering commands)
Scheduling relatively to now
And as always, read much more on how to use this tool in the man page for it.
If you use at, the output of the command will be emailed to you. To output text to the current terminal do the following:
Note that when you use now + x minutes, the execution time will be rounded to the previous minute.