1. Have a look into /etc/inittab and see whether you understand meaning of
   all items in there. How would you assure that user, who presses
   well-known combo Ctrl+Alt+Del, would get message about current time
   instead of reboot. And how would you add a seventh console to the six
   default ones?

   Uncomfortable finding: You can't try this on virtual machines :-(

2. To which runlevel do these virtual machines boot by default? What is the
   purpose of runlevels 0 and 6? Which scripts are started in them? Have a
   look on those scripts and see, what is being started/stopped.

3. Which scripts are being started in "default" runlevel? Have a look on
   them! Where are started scripts SnnName and KnnName mentioned
   in the lecture being started from?

4. Have a look at manpage for commands "shutdownm" and "telinit" and try
   switching from one runlevel to another one, or eventually scheduling
   computer shutdown.

5. Using scheduler 'at' set up shutdown of your computer at the end of
   exercises. Try also commands 'atq' and 'atrm'. What is the maximal time
   precision you can expect from commands scheduled using 'at'?

6. Try playing with the 'crontab' command. Assure, that every 10 minutes
   every user logged on your computer will get an information about current
   time. Of course, it should happen only during exercises. With what
   precision can you schedule command execution from 'cron'?

   Note: Commands 'write' and 'wall' might come handy.