Shutting Down and Rebooting

Log out current user
logout 

reboot a machine
reboot or shutdown -r

You must halt a system to turn it off
/sbin/halt then power the box off or shutdown -h now

Start the next X window session on the display
startx 
 

Users and Groups

Add a  user to system 
usage: adduser userid 
useradd is also acceptable

Create a new group on the system
groupadd 

Show which groups you are in
Groups

Prints list of users on the system
users 

Change group associated with a file. Can be used to change the group associated with subdirectories and files of a directory
chgrp 
usage: chgrp group files 
or: chgrp -R group files 

Change ownership of a file. Can be used recursively.
chown 
usage: chown userid files 
or: chown -R userid files 

Change login password
passwd

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