User and Group Management

useradd user1

create user1 user account

passwd user1

create password for user1 user

switch user account

logout user

userdel user1

delete user account user1

usermod -l user2 user1

change user1 login name to user2

groupadd group1

add group group1

groupdel group1

delete group group1

gpasswd -a user1 group1

add single user user1 to group group1

gpasswd -M user1,user2 group1

add multiple users user1 user2 to group group1

gpasswd -d user1 group1

remove user user1 from group group1

gpasswd -A user1 group1

make user1 as admin of group1