[Icecast] Newbie Questions

[Will Robedee]

I inherited an icecast server at a radio station.  I am not a linux/unix
person.  I am able to use putty and winscp to gain access.  I can use sudo
-s -H to gain root level access (dangerous, I know), but I do not know the
OS (or even which OS variant). 
 
First question, how do I determine what OS is being used?
 
Next question, I want to use logrotate.d to rotate (and archive) logs on a
monthly basis.  How is that done? 
 
What is a PID?
 
(Yes, I am a newbie!)
 
Will R
 
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