Linux Commands - User and Group Management

Create a new user

Creates a basic user on the system.

useradd usuario

Create user with full option

Allows specifying additional information such as name, group, home directory, and shell.

useradd -c "User Name" -g group -d /home/user -s /bin/bash usuario

Delete user

Removes a user from the system.

userdel usuario

Delete user and remove their home directory

Removes a user and their associated personal directory.

userdel -r usuario

Change user attributes

Modifies the information of an existing user.

usermod -c "User name" -g group -d /home/user -s /bin/bash usuario

Change the password of the user themselves

Allows the user to change their own password.

passwd

Change the password of another user

Allows the root user to change the password of another user.

passwd usuario

Set an expiration date for the user password

Establishes a specific date when the user password will no longer be valid.

chage -E 2014-12-31 usuario

View information about the user

Displays details about the user, such as groups they belong to.

id usuario

List users

Displays all users on the system.

cat /etc/passwd

Create user group

Creates a new group on the system.

groupadd group_name

Delete user group

Removes a group from the system.

groupdel group_name

Rename user group

Changes the name of an existing group.

groupmod -n new_name old_name

Modify the current group of a user

Changes the active group of the current user who belongs to multiple groups.

newgrp group

List groups of the current user

Displays the groups to which the current user belongs.

groups

List all groups

Displays all groups defined on the system.

cut -d: -f1 /etc/group

Add user to an existing group

Adds a user to a specific group.

usermod -aG group_name usuario

Remove user from a group

Removes a user from a specific group.

gpasswd -d usuario group_name