USERS / ENVIRONMENT

passwd -f                        Change current users gecos (user description)
passwd -s                        Change current users shell

chfn (username)                  Changes users gecos
chsh (username) (shell)          Changes users shell

env              Displays values of environment variables
printenv

id               Displays current user's uid and gid details
id (user)        Displays user uid and gid details

whoami           Displays current user details
who am i         (or who -m)        

who              Displays details of all users currently logged in.
w
who -b           Displays system reboot time

uptime           Displays number of users logged in, time since last
                 reboot, and the machine load averages.

lsuser ALL                              Lists all users details
lsuser (username)                       Lists details for user
lsuser -a(attribute) (username or ALL)  Lists user attributes
lsuser -a home ALL 

mkuser -a(attributes) (newuser)         Add a new user

chuser (attributes) (user)              Change a user
chuser login=false (user)               Lock a user account

rmuser -p (user)              Removes a user and all entries in security files

usrck -t ALL                  Checks all the user entires are okay.

fuser -u (logical volume)     Displays processes using the files in that LV
fuser -k /dev/lv02            Will send a kill signal to all processes using
                              /dev/lv02

lsattr -D -l sys0 -a maxuproc        Displays max number of processes per user
chdev -l sys0 -a maxuproc=(number)   Changes max number of processes per user

chlang (language)             Changes the language settings for system or user.
         En_GB   = PC850 code pages
         en_GB   = ISO8859 code pages (Great Britain)
           C     = posix

su - (user)      Switch to new user and change to the new users environment.
su (user)        Switch to new user, current environment is propated to the
                 new shell.