As both UID and GID maintain they must have an associated value to function, that is the ID of the "current process" by default. Ok, I got that down.

Now: all the process ID's I can observe (through System Monitor) have ID-numbers in the thousands. The group number of root is zero and that of "users" is one-hundred. The GID of /windows (on my system) is 46. Why?

I'm assuming that the number is meant to be in octal, but is there a list that I pull up?...

System groups are usually below 100 - Anything >= 100 are typically your groups for random purposes.

See here:
http://www.yolinux.com/TUTORIALS/Lin...ingGroups.html

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I think you are confusing different 'IDs'.

Every user on a system must have a UID - user id (see /etc/passwd) and a GID - group id (see /etc/passwd & /etc/group).
root user is always UID = 0, GID = 0.

Every process on a system must have a PID - process id; dynamically generated by the kernel (PID 1 is the init process and never changes).
PIDs (apart from init = 1) are recyled (re-used) when the kernel reached PID 9999, assuming the 'next' PID is not currently being used.

Note that UIDs, GIDs and PIDs are separate lists or number-spaces, so the same value can appear in all of those lists, but do not interfere with each other.

Think of 3 different streets, all numbered the same; there's no house confusion because they are on different streets.
(Actually, there's no PID=0, but you get the point).


BTW, all these nums are decimal.

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