Chapter 14

1. What is scheduling?
   Scheduling allows us to define when and how a script should run, without the need for the user to be interactive at that time.
2. What do we mean with ad-hoc scheduling?
   Ad-hoc scheduling, which we normally do with at on Linux, is scheduling that is not periodically repeated, but often a one-time job at a fixed time.
3. Where does the output of commands run with at normally go?
   By default, at tries to use sendmail to send a local mail to the user who owns the queue/job. If sendmail is not installed, the output is gone.
4. How is scheduling for the cron daemon most often implemented?
   As a user-bound crontab.
5. Which commands allows you to edit your personal crontab?
   The command crontab -e. Furthermore, you can list the current crontab with crontab -l and remove the current crontab with crontab -r.
6. Which five fields are present in the crontab timestamp syntax...