Usually, when we talk of listing member of any unix group, let’s say, linux, then it really gets a bit complicated, there are number of ways to get the group members details as below 1. cat /etc/group 2. id [user_name] [...]
User Account
Create User in Linux from Command Line and Its Options
User administration is an important task for system administrator. This article discusses how to create new users in Linux and how the login details of a user can be customized while adding the user. Adding User Only root user can [...]
Linux Usermod Command with Examples
Linux usermod command is used to modify or change an existing user’s attributes. User's attributes are home directory, shell, password expiration date, groups, UID etc. When the command runs, data in the /etc/passwd (user account information), /etc/shadow (secure account information) [...]
How to List All Users in Linux
In Linux, you will be able to find two types of users, which are normal users (created using useradd command) and system users. Most of the system users are created while installing the OS which creates the users during various [...]
[Solution] Cannot lock /etc/passwd; try again later - Useradd Error
Sometime in Linux when adding user using the useradd command it throws the error 'Cannot lock /etc/passwd; try again later' as shown below: #useradd test useradd: cannot lock /etc/passwd; try again later Answer: The system files that are related to [...]
/etc/shadow File in Linux Explained
In this tutorial, we will understand how the file /etc/shadow formated and why it is used for. The file /etc/shadow can be read-only by the system user ‘root’. In Linux, when you create a user (using useradd command) the account [...]
/etc/passwd File in Linux Explained
On Linux systems, user account information such as username, User ID (UID), Group ID (GID), home directory and shell are kept in a plain text file called /etc/passwd. When a user is created, system files such as /etc/passwd, /etc/shadow and [...]
How to use su Command in Linux
In this tutorial we learn what is su command (switch user) in Unix/Linux and the difference between su and su - commands. Linux is a multiuser operating system kernel which means multiple users can log in to a Linux system [...]
How to Add User to Sudoers in Linux
Sudo access allows a user to execute all permitted commands as root or as any other user. Once the sudo access is given to a specific user in sudoers file, that user can execute the commands as root by executing [...]
How to Lock (Disable) User Account in Linux
Linux systems allow you to lock or disable access to a particular user account without changing anything from the account. This might be useful if you do not want to remove user account permanently but, you just want it disabled [...]