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4.6. Exercises
These are some exercises that will help you get the feel for processes running on your system.
4.6.1. General
• Run top in one terminal while you do the exercises in another.
• Run the ps command.
• Read the man pages to find out how to display all your processes.
• Run the command find /. What effect does it have on system load? Stop this command.
• In graphical mode, start the xclock program in the foreground. Then let it run in the background. Stop the program using the kill command.
• Run the xcalc directly in the background, so that the prompt of the issuing terminal is released.
• What does kill -9 -1 do?
• Open two terminals or terminal windows again and use write to send a message from one to the other.
• Issue the dmesg command. What does it tell?
• How long does it take to execute ls in the current directory?
• Based on process entries in /proc, owned by your UID, how would you work to find out which processes these actually represent?
• How long has your system been running?
• Which is your current TTY?