Cyclades AlterPath ACS - Who Is Logged in and What They Are Doing; Linux File Structure

350 | Appendix A - New User Background Information
# addgroup wheel
In file /etc/group there should be a line with at least the following:
wheel::zzz:
Step 2 - Belong to the group wheel.
An administrator with root access would edit /etc/group file and insert the
username at the end of the wheel line. For example, for user steve, the
administrator would edit the line in file/etc/group:
wheel::zzz:
to add "steve" at the end like this:
wheel::zzz:steve
A.2 Who is logged in and what they are doing
The command “w” displays information about the users currently on the machine, and
their processes. It calls two commands: w_ori and w_cas. The w_ori is the new name of
the original command “w” and the w_cas shows the CAS sessions information.
The header of w_ori shows, in this order: the current time, how long the system has been
running, how many users are currently logged on (excluded the CAS users), and the
system load averages for the past 1, 5, and 15 minutes.
The following entries are displayed for each user (excluded the CAS users): login name,
the tty name, the remote host, login time, idle time, JCPU time (it is the time used by all
processes attached to the tty), PCPU time (it is the time used by the current process,
named in the “what” field), and the command line of their current process.
The header of w_cas shows how many CAS users are currently logged on. The following
entries are displayed for each CAS user: login name, the tty name, the remote host and
remote port, login time, the process ID and the command line of the current process.
A.3 Linux File Structure
The Linux file system is organized hierarchically, with the base (or root) directory
represented by the symbol “/”. All folders and files are nested within each other below
this base directory. The directories located just below the base directory are:
• /home - Contains the work directories of system users.
• /bin - Contains applications and utilities used during system initialization.
• /dev - Contains files for devices and ports.
• /etc - Contains configuration files specific to the operating system.