adduser.conf (5)     - configuration file for adduser(8) and addgroup(8) .
deluser.conf (5)     - configuration file for deluser(8) and delgroup(8) .
HEAD (1p)            - Simple command line user agent
access (2)           - check real user's permissions for a file
addgroup (8)         - add a user or group to the system
adduser (8)          - add a user or group to the system
arpd (8)             - userspace arp daemon.
bsd-write (1)        - send a message to another user
chage (1)            - change user password expiry information
chfn (1)             - change real user name and information
crontab (1)          - maintain crontab files for individual users (Vixie Cron)
cuserid (3)          - get username
defoma-user (1)      - Debian Font Manager for users
delgroup (8)         - remove a user or group from the system
deluser (8)          - remove a user or group from the system
eaccess (3)          - check effective user's permissions for a file
endusershell (3)     - get permitted user shells
environ (7)          - user environment
euidaccess (3)       - check effective user's permissions for a file
faccessat (2)        - check user's permissions of a file relative to a direc...
fuser (1)            - identify processes using files or sockets
fusermount (1)       - mount FUSE filesystems
futex (2)            - Fast Userspace Locking system call
futex (4)            - Fast Userspace Locking
futex (7)            - Fast Userspace Locking
GET (1p)             - Simple command line user agent
getcontext (2)       - get or set the user context
geteuid (2)          - get user identity
geteuid32 (2)        - get user identity
getgrouplist (3)     - get list of groups to which a user belongs
getlogin (3)         - get username
getlogin_r (3)       - get username
getresgid (2)        - get real, effective and saved user/group IDs
getresgid32 (2)      - get real, effective and saved user/group IDs
getresuid (2)        - get real, effective and saved user/group IDs
getresuid32 (2)      - get real, effective and saved user/group IDs
getuid (2)           - get user identity
getuid32 (2)         - get user identity
getusershell (3)     - get permitted user shells
gnome-keyring-daemon (1) - keep password and other secrets for users
gnome-power-manager (1) - gnome power manager userspace daemon
gnome-screenshot (1) - capture the screen, a window, or an user-defined area ...
gnome-wm (1)         - Launches the user selected window manager for the GNOM...
group (5)            - user group file
groups (1)           - print the groups a user is in
hosts.equiv (5)      - list of hosts and users that are granted "trusted"r co...
HTML::Tree::AboutObjects (3pm) - - article: "User's View of Object-Oriented M...
id (1)               - print real and effective user and group IDs
intro (1)            - Introduction to user commands
iruserok (3)         - routines for returning a stream to a remote command
last (1)             - show listing of last logged in users
lastb (1)            - show listing of last logged in users
lastlog (8)          - reports the most recent login of all users or of a giv...
logname (1)          - print user's login name
lwp-request (1p)     - Simple command line user agent
LWP::UserAgent (3pm) - Web user agent class
makecontext (3)      - manipulate user context
mount.fuse.ntfs (8)  - Read/Write userspace NTFS driver.
mount.ntfs-fuse (8)  - Read/Write userspace NTFS driver.
netlink (7)          - Communication between kernel and userspace (AF_NETLINK)
newusers (8)         - update and create new users in batch
nologin (5)          - prevent unprivileged users from logging into the system
ntfs-3g.usermap (8)  - NTFS Building a User Mapping File
ntfsmount (8)        - Read/Write userspace NTFS driver.
pam_issue (8)        - PAM module to add issue file to user prompt
pam_localuser (8)    - require users to be listed in /etc/passwd
pam_loginuid (8)     - Record user's login uid to the process attribute
pam_mkhomedir (8)    - PAM module to create users home directory
pam_nologin (8)      - Prevent non-root users from login
pam_tty_audit (8)    - Enable or disable TTY auditing for specified users
pam_userdb (8)       - PAM module to authenticate against a db database
pam_xauth (8)        - PAM module to forward xauth keys between users
Pango::Matrix (3pm)  - A structure specifying a transformation between user-s...
passwd (1)           - change user password
PF_NETLINK (7)       - Communication between kernel and userspace (AF_NETLINK)
pkexec (1)           - Execute a command as another user
POST (1p)            - Simple command line user agent
readline (3readline) - get a line from a user with editing
ruserok (3)          - routines for returning a stream to a remote command
select-default-iwrap (1) - Selects the user default ispell dictionary for use...
setcontext (2)       - get or set the user context
setegid (2)          - set effective user or group ID
seteuid (2)          - set effective user or group ID
setfsuid (2)         - set user identity used for file system checks
setfsuid32 (2)       - set user identity used for file system checks
setregid (2)         - set real and/or effective user or group ID
setregid32 (2)       - set real and/or effective user or group ID
setresgid (2)        - set real, effective and saved user or group ID
setresgid32 (2)      - set real, effective and saved user or group ID
setresuid (2)        - set real, effective and saved user or group ID
setresuid32 (2)      - set real, effective and saved user or group ID
setreuid (2)         - set real and/or effective user or group ID
setreuid32 (2)       - set real and/or effective user or group ID
setuid (2)           - set user identity
setuid32 (2)         - set user identity
setusershell (3)     - get permitted user shells
su (1)               - change user ID or become superuser
sudo (8)             - execute a command as another user
sudoedit (8)         - execute a command as another user
sudoers (5)          - list of which users may execute what
sulogin (8)          - Single-user login
swapcontext (3)      - manipulate user context
tasksel (8)          - a user interface for installing tasks
ttyslot (3)          - find the slot of the current user's terminal in some file
ucf (1)              - Update Configuration File: preserve user changes in co...
udp (7)              - User Datagram Protocol for IPv4
udplite (7)          - Lightweight User Datagram Protocol
ulimit (3)           - get and set user limits
unix_chkpwd (8)      - Helper binary that verifies the password of the curren...
unix_update (8)      - Helper binary that updates the password of a given user
useradd (8)          - create a new user or update default new user information
userdel (8)          - delete a user account and related files
usermod (8)          - modify a user account
users (1)            - print the user names of users currently logged in to t...
vmsplice (2)         - splice user pages into a pipe
wall (1)             - write a message to users
whoami (1)           - print effective userid
write (1)            - send a message to another user
xkbbell (1)          - XKB extension user utility
xkbvleds (1)         - XKB extension user utility
xkbwatch (1)         - XKB extension user utility
xset (1)             - user preference utility for X