Student questions: one linercommand in the directory proc

[tobeye]

Hello,

I'm a student following an Operating Systems course. I need to make a small task on Linux using information found in the directory /proc. I'm stuck on some questions.

I may not use commands like 'ps' ..., all the information must come from /proc/

All the work must be done be parsing files in de directory proc.

Any help would be great!

1. Where does the command free gets its data from? Interpret the output
(something with strace?)

2. How much time was the processor unemployed since boot? Calculate the percentage of the total time which the processor was unemployed, and the percentage of the useful processor time that has been used by the operating system
(using the file /proc/uptime)

3.· How much memory is available on this machine, and how much is still available? Is the swap space used at the moment? Which process occupies the largest amount of system ram?

4. How can you (as root) through /proc:

- Change the reaction of the system to ctrl-alt-del? What are the possible actions?

- Don't respond to ICMP Echo requests anymore (ping requests)?


5. List (use only one command line) all processes in the state RUNNING.

[oz]

Hello and welcome to the forums, Tobeye!

We're sorry, but homework questions are not allowed on the forums:

http://www.linuxforums.org/forum/lin...ums-rules.html

With any luck, you might be able to google the answers you seek.