Tagged: passwd

Blog / CentOS / Debian / Fedora / Kali / Linux / Mint / RedHat / Ubuntu

02/08/2018

How to Become SuperUser or Root with su Command In Linux?

Linux provides root account as superuser or Administrator. As root account has all privileges to manage a system this may be a threat for misuse or error of administrators. We generally use normal user accounts in daily operation and change to the superuser with su command. Root root exist all Linux systems and can not be deleted because of Linux privileges administration logic. root user has special home directory located /root and other users can...

Blog / Debian / Kali / Linux / Mint / Ubuntu

21/12/2017

How To Add and Delete User on Ubuntu From Shell

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 deletion. Root Privileges In order to add or remove user from a Linux box we...

Blog / CentOS / CISSP / Debian / Fedora / Kali / Linux / Linux / Mint / RedHat / Security / Ubuntu

27/11/2017

How To Change User Password with passwd In Linux and /etc/passwd File

passwd command is used to change password and provides information about Linux accounts. Normal or root user can change passwords. Normal user can only change his own password in the other hand root can change all users passwords. Passwords related information is stored in /etc/passwd file. Only password which is stored as hash is stored in /etc/shadow . Password File As stated previously user account related information is stored in /etc/passwd . There is information...

Blog / CentOS / Debian / Fedora / Kali / Linux / Mint / RedHat / Ubuntu

27/05/2017

Linux User Management

Linux operating system have users to operate applications, services and other stuff. Multiple users can be interact with Linux and we call it multi-user. It may be ridiculous but long time ago operating systems was single user. Which means to work on a system other users should sign out. Now in our era we have no restrictions like that. Adding User There is a default user named root almost all...

Blog / CentOS / Debian / Fedora / Linux / Mint / RedHat / Ubuntu

26/02/2017

Linux usermod Command Tutorial With Examples

Linux provides usermod command by default for the most of the distributions. This command is used to user modification. After user creation the user related information, values and policies can be changed with usermod command. In this tutorial we will look various features of usermod command with examples. Syntax Syntax of the usermod command is like below.

usermod [options] LOGIN

1	usermod [options] LOGIN

Help

$ usermod -h

1	$ usermod -h

Add Comment or Information User information is stored in a file...

Blog / CentOS / Debian / Fedora / Kali / Linux / Mint / RedHat / Ubuntu

15/11/2016

How To Secure Linux From Automated Attacks?

Linux servers used around the world dominantly in internet. They are used as web server, file server, application server etc. Being on internet creates som risk for these systems. There are different risks on the internet. One of them is automated attackers who uses scripts and tool in a automated fashion. Linux systems should be protected this type of attackers too. Here I will provide some tips about protecting our...

Blog / CentOS / Debian / Fedora / Kali / Linux / Mint / RedHat / Ubuntu

07/11/2016

How To Change or Rename Username and User ID In Linux?

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 to big changes we will list users detailed info with cat command like below.

$ cat /etc/passwd | grep ismail

1	$ cat /etc/passwd \| grep ismail

...

Blog / CentOS / Debian / Fedora / Kali / Linux / Mint / RedHat / Ubuntu

07/11/2016

How To Set or Change User Password In Linux?

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 more secure. Change Current User Password To change a user password we need password change...

Blog / CentOS / Debian / Fedora / Kali / Linux / Mint / RedHat / Ubuntu

07/11/2016

How To Add A User To A Group?

In Linux users may have different groups registered. By default adding a user to the Linux system will create new user. There are different commands to change user group one of them is useradd which actually create new user and sets given group to the newly created user. As always we need root privileges to change user group. List Users Before starting to add user into a group we will...

Blog / CentOS / Debian / Fedora / Kali / Linux / Mint / RedHat / Ubuntu

07/11/2016

How To Delete Remove User Accounts In Linux?

How can I remove a Linux user account from Linux system. As you know user management in Linux requires root privileges. While removing user his home directory can be remove or preserved. As same with mail box. User mailbox can be preserved. List Existing Accounts Before removing or deleting an user account checking the existing of account can be useful. We can check whether given account exist with different ways. In...

Tagged: passwd

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