Linux User, user group Rights Management detailed---02

2, user, user group management operation detailed:

2.1 AddUser Add Users:

AddUser [-u uid][-g group][-d home][-s Shell]

- u: give directly the UserID

- G: give directly the GID

- D: directly establish the root directory in an existing directory         

- S: definition Shell

Add User Garfield

1	adduser garfield

Verify that the user Garfield was successfully added through the three user management files described earlier:

When we create new users, the basic settings for new users are implemented through the/etc/login.defs and/etc/default/useradd two files.

Cat/etc/login.defs

Cat/etc/default/useradd

in this file Skel This option specifies that the user's root directory content is copied from the/etc/skel directory in the past.

2.2 passwd Set User password:

passwd [user name] setting password

2.3 usermod Disable, Enable account:

usermod-l [user name ] Disable account

usermod-u [user name ] Enable account

usermod-e yyyy-mm-dd [user name ]

Usermod command to disable and enable accounts through the /etc/shadow the corresponding user password bit before adding and deleting "!" to implement.

2.4 Groupadd Create Group:

Groupadd [-G gid [-o]] [-R] [-F] Group

2.4.1 when creating a user, specify that the user belongs to that user group :

Usersadd-g group_name user_name

2.4.2 to change a user's user group:

Usermod–g group_name user_name

2.4.3 adding users to other groups:

Usermod–g group_name user_name

2.5 Modify the name of the group:

Groupmod-n new_group_name old_ group_name

2.6 Modify User name:

Usermod–l New_user_name old_ user_name

2.7 Deleting a User:

Userdel [-R] User_name

2.8 To Delete a group:

Groupdel group_name

Linux User, user group Rights Management detailed---02