04-15-2011
A simple cat /etc/passwd | wc -l will give the total system users.
However, if are you trying to separate actual user's from system usernames?
You will need to test $UID's above the base user ID number, depending on your distro.
In my Fedora 13 system the base user ID is 500, and in my ubuntu 10.04 system, the base user ID is 1000.
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LEARN ABOUT LINUX
pam_localuser
PAM_LOCALUSER(8) Linux-PAM Manual PAM_LOCALUSER(8)
NAME
pam_localuser - require users to be listed in /etc/passwd
SYNOPSIS
pam_localuser.so [debug] [file=/path/passwd]
DESCRIPTION
pam_localuser is a PAM module to help implementing site-wide login policies, where they typically include a subset of the network's users
and a few accounts that are local to a particular workstation. Using pam_localuser and pam_wheel or pam_listfile is an effective way to
restrict access to either local users and/or a subset of the network's users.
This could also be implemented using pam_listfile.so and a very short awk script invoked by cron, but it's common enough to have been
separated out.
OPTIONS
debug
Print debug information.
file=/path/passwd
Use a file other than /etc/passwd.
MODULE TYPES PROVIDED
All module types (account, auth, password and session) are provided.
RETURN VALUES
PAM_SUCCESS
The new localuser was set successfully.
PAM_SERVICE_ERR
No username was given.
PAM_USER_UNKNOWN
User not known.
EXAMPLES
Add the following line to /etc/pam.d/su to allow only local users in group wheel to use su.
account sufficient pam_localuser.so
account required pam_wheel.so
FILES
/etc/passwd
Local user account information.
SEE ALSO
pam.conf(5), pam.d(5), pam(7)
AUTHOR
pam_localuser was written by Nalin Dahyabhai <nalin@redhat.com>.
Linux-PAM Manual 06/04/2011 PAM_LOCALUSER(8)