Linux user groups and user management

• View information for all groups: (Information is saved in the/etc/group file)

• Each of these pieces of information is divided by: the meaning of each paragraph is as follows:

  　User name Group name: password: User group ID: User group contains users (multiple users, split)

• View all user information: (Information saved in the/etc/passwd file)

Each of these pieces of information is divided by: the meaning of each paragraph is as follows:

　　User name: password: User id: ID of the user group: note Information: User directory: directory where the command is located

• View a user's information
  • Command: CAT/ETC/PASSWD | grep User Name

• View a user group information
  • Command: Cat/etc/group |grep Group name

• View group member information for the currently logged in user
  • Command: Groups

• View user groups and members within a group
• Command: Groups user

• View the currently logged in user name
  • Command: WhoAmI

  • 　

• Add Users
  • Command: Useradd user name
  • Example: Useradd Sky

• Add users to the home directory at the same time
  • Command: USERADD-M user name
  • Example: Useradd-m Sky

• Delete User
  • Command: Userdel user name
  • Example: Userdel Sky

• Delete user and delete user name directory under home directory
  • Command: Userdel-r user name
  • For example: Userdel-r Sky #系统将自动删除/home/sky This user directory, regardless of whether the directory is empty

• Setting and modifying user passwords
  • Command: passwd user name
  • Example: passwd Sky #这样系统要求输入两次密码

Linux user groups and user management