Basic Operation 04 (User and Group command) under Linux __linux

Add a Tom user, set it to belong to the Users group, and add comment information
Step-by-Step: Useradd Tom
Usermod-g users Tom
Usermod-c "HR Tom" Tom
One step complete: useradd-g users-c "hr Tom" Tom


Set the Tom User's password
passwd, Tom.


Change Tom User's login name to Tomcat
Usermod-l Tomcat Tom


Adding Tomcat to the SYS and root groups
Usermod-g Sys,root Tomcat


View group information for Tomcat
Groups Tomcat


Add a Jerry user and set a password
Useradd Jerry.
passwd Jerry.


Add a America Group
Groupadd America


Add Jerry to the America group
Usermod-g America Jerry


Remove Tomcat users from the root group and SYS group
gpasswd-d Tomcat Root
gpasswd-d Tomcat SYS


Modify the America group name to AM
Groupmod-n am America