Learn about the Linux user and group management commands below.
Useradd : Useradd-create A new user or update default new user information Use format: useradd [options] LOGIN - u : The UID is followed by the specified user UID. - G : The GID is followed by the specified user's valid group. - G : The next group name is the additional group that the account can join. - M : Mandatory! Do not create user home directory! (Default value for System account). - M : Mandatory! To create a user home directory! (The default value of the general account). - D : Specifies that a directory becomes a home directory without using default values. Be sure to use absolute paths! - R : Set up a System account, the UID of this account will be limited (refer to/etc/login.defs) - S : followed by a shell, default is/bin/bash if not specified Related File information: User account password parameters of the file:/etc/passwd,/etc/shadow Profiles related to user groups:/etc/group,/etc/gshadow Passwd: passwd-update user ' s authentication tokens Use format: passwd [options] ... Name - L: Lock This account - u: unlock This account --stdin: use the data from the previous pipeline as input to the password Relevant file information:/ETC/PAM.D/PASSWD Chage : Hage-change User password expiry information Use format: chage [options] [LOGIN] - D 0: indicates that the user must change the password to enter the system when logging in. Usermod : usermod-modify a user account Use format: usermod [options] LOGIN - D: after the user's home directory, modify the user home directory - G: next to the user's valid group, modify the active group - G: next to the user's additional group, modify the additional group - L: after the user's account name, modify the user name - S: Modify Shell - u: Modify UID - L: Lock the user - u: Unlock
Userdel : Userdel-delete A user account and related files Use format: Userdel [options] LOGIN - R: deleted along with user home directory CHFN: Chfn-change your finger information use format: CHFN [option] ... username - F : followed by the full name - o : Your office room number - P : The telephone number of the Office - H : The home phone number CHCH: Change Shell Use format: CHCH [option]...username - L: list system available shells - S: Modify Shell Groupadd: groupadd-create a new group Use format: groupadd [options] Group - G: Specify the group ID - R: set up system groups Groupmod : groupmod-modify A group definition on the system Use format: groupmod [options] GROUP - G: Modify GID - N: Modify Group name Groupdel : Groupdel-delete a group Use format: Groupdel Group gpasswd: Gpasswd-administer/etc/group And/etc/gshadow Use format: gpasswd [option] Group : no parameters, indicating a password for the group -A: Specify the group administrator -M: Add an account to this group - R: Removing a group password - R: to invalidate a group's password bar # use format for Group admins: -A : join a user to a group - D: remove a group from a user
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