User identity and user management

Network: Defining Network Properties
User: User Management
Permissions: Root
sudo: Switch user execution commands,
SUID: A user can execute a command from a host as another user

sudo configuration file:/etc/sudoers
To edit the sudo configuration file command Visudo
A sudo entry:
Who which_hosts= (runas) command

Who:user_alias
Which_hosts:host_alias
Runs:runas_alias
Command:cmnd-alias
Aliases must all be combined with uppercase English letters

Alias:
User aliases
User_alias useradmin =
Group name, using & quotation marks
You can also include other user aliases that are already

Host--alisa
Host Name
Ip
Network address
Other host aliases
Comand_alias useradmincmnd=
Command path
Directory (all commands for commands in this directory other implementation-defined command aliases)

sudo command:
-L: Lists all sudo class commands that the current user can use
-K: Invalid information for sudo authentication
-PASSWD do not allow current user to enter password

User identity and user management