1. top

2. ps

3. man ps
   ps aux or ps -e
   

4. The load on cpu goes very high. To stop, use Ctrl-C.

5. xclock
   Ctrl-Z (stops the xclock. Ctrl-C would kill it)
   bg
   ps |grep xclock
   kill <pid for xclock> 
   (or kill -15 <pid for xclock> for SIGTERM, 
   or kill -9 <pid for xclock> for SIGKILL)
      

6.  xcalc & 

7. From “EXAMPLES” in man kill : “Kill all processes you can kill”

8. $ who
   ajlewis2 pts/0        2006-11-25 21:54 (:0.0)
   ajlewis2 pts/1        2006-11-26 14:38 (:0.0)
   $ write ajlewis2 pts/1
   hello there!
   what's happening?
   

   • After typing the write command, there may be a beep and there will be a new line. Type message. After you are finished, do Ctrl-C.
   • The write command is not enabled in all distributions.
   • In that case, for an alternative to this command, try:

   • $ who
     ajlewis2 pts/0        2006-11-25 21:54 (:0.0)
     ajlewis2 pts/1        2006-11-25 21:54 (:0.0)
     $ echo "Hello user, let's have lunch together?" > /dev/pts1
     

9. displays bootup messages from the kernel and modules. System administration command.
10. practically instantaneous (.005 seconds) since there are few files in the directory

    • time ls
      real    0m0.005s
      

11. ps aux | grep "ajlewis2" 
    (replace ajlewis2 with the appropriate user name)
    

    • There are a lot of options to read about in man ps. To find a UID, there is a command called getuid. However, it is not recognized in Debian Etch.

12.  uptime 

13.  tty, or who 

14. [Removed question from exercises]
15. mount, umount, su. Commands that affect the system, but may need to be run by authorized users
16. Look for processes at the top of:

    • top

1. ?
2. ?

3. telinit 5
   telinit 3
   

4. ?

5. uname -r
   

6. One of the following or similar:
   • Move deliver_pizza to /etc/rc4.d or wherever your run level 4 script links are located
   • Move deliver_pizza to /etc/init.d and link to it from /etc/rc4.d
   • Simply link to the current location of deliver_pizza from /etc/rc4.d
   • Create a new script that runs deliver_pizza and put it in /etc/init.d with a link to it in /etc/rc4.d

1. (sleep 600; echo Pasta\'s ready) &

2. at 20:58
   at> cp -a ~/* /var/tmp/anita-home/
       

   • Then do Ctrl-D which produces

     at> <EOT>
         

3. crontab -e and add:

   00 12 * * 1-5   cp -a ~/* /var/tmp/anita-home/
       

4. Check for results after the time has passed
5. Should get an email reporting error. I don't have internal mail set up.

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