01-18-2012
You are lines in /etc/passwd, /etc/shadow, and /etc/groups. These are the bare minimum for a user to login on a UNIX system normally. It's possible for root to force a login into arbitrary UID numbers that don't actually exist, though. Nothing explodes when this happens. They just show up as a number instead of a name, start sitting in /, and have no home directory, no groups, no anything.
Real, actual, login-as-people users probably have a folder under /home/ as well.
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LEARN ABOUT OSF1
w2kusers.deny
w2kusers.deny(4) Kernel Interfaces Manual w2kusers.deny(4)
NAME
w2kusers.deny - Authentication file for Windows 2000 Single Sign On.
SYNOPSIS
# Comment account_name
DESCRIPTION
The w2kusers.deny is a text file containing a list of user account names. When an account is included in this file, the Windows 2000 Sin-
gle Sign-On software verifies only the UNIX authentication for the named account.
To add user accounts to the file, use a text editor to enter the user's UNIX account name. The following syntax rules apply to the
w2kusers.deny file: Only one user name can be entered on a line. The user name must exactly match a user name in the UNIX /etc/passwd
file. Comment lines begin with a pound sign (#).
EXAMPLES
The following example shows a typical w2kusers.deny file: # The following file lists account names that are not allowed to use # the Win-
dows 2000 authentication information when it is enabled. # Account names must match exactly the user account name in the # /etc/passwd
file. # # Syntax: account_1 # . # . # . # account_n # root nobody nobodyV daemon bin uucp
uucpa auth cron lp tcb adm ris wnn pop imap Peter Dave Beth Martha
FILES
Location of the file.
RELATED INFORMATION
Commands: ldapcd(8), lw2ksetup(8)
Files: etc/w2kusers.deny(4)
Windows 2000 Single Sign-OnInstallation and Administration Guide.
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w2kusers.deny(4)