Linux, Windows, Security, Programming, Network Tutorials
User is an entity that has the right to use some resources, applications, equipment, process, or system. Operating systems and applications generally have users to authorize and authenticate their actions. Also, users are used to storing data personally in a private area like Home or Users. Linux Users Linux is an operating system and it … Read more
Linux uses groups in order to share resources in a easy way. In general a resource will have a user, group and other access rights. In this tutorial we will learn how to add user to a Linux group and its variations like creating group, deleting group, listing group members etc. Linux Groups Linux groups … Read more
Ubuntu is a popular distributions used by a lot of companies as Desktop and Server. As a system administrator one of the most recurring job is changing existing user group. In this tutorial we will look how to accomplish this task and some helper commands about this. Primary Group Primary group specifies the user first … Read more
chmod is very useful tool to manage file modes like read write execute. One of the most used option for chmod is +x which stands for execution rights. In this tutorial we will look different use cases for user or owner, group and others roles. List Current User and Group Of A File We generally need to … Read more
Linux users can be added with different ways. but one of the most used way is adding them throughout the shell because Linux admins loves shell usage. In this tutorial we will look how to add user into a Ubuntu, Kali, Mint, Debian box and provide or change required parameters. We will also look user … Read more
passwd command is used to change passwords and provides information about Linux accounts. Normal or root user can change passwords. Normal users can only change their own password on the other hand root can change all user’s passwords. Passwords related information is stored in /etc/passwd file. The only password which is stored as the hash is stored in … Read more
The su short for substitute super user command using to change currently logged user. This makes things practical because the user change made without login. Su command can be used to get root privileges too. su and sudo commands have different ways to act for similar aims. su Command Syntax su command has very simple syntax … Read more
I have a lot of users in my Linux servers. Security is important for me. I know that one of the important security measure is passwords. The length, complexity, change period etc. How can I force user to change password in first login? We will use change command to force user change password in the first … Read more
The problem is we want to change the already created user name or user id. As we know there is a lot of configuration those rely on the user id like permissions. We will use usermod command to make this change. Keep in mind this changes will effects system wide. List User Info Before starting … Read more
Linux passwords are used to authenticate users. Linux passwords was hold in /etc/passwd file with other user related information like default shell, home directory path etc. Now in modern Linux distributions holds passwords in /etc/shadow file which have restricted access. This file holds user passwords as hash values with salt. Hashing and salting makes passwords … Read more