/etc/shadow HowTo - Linux / Unix Q & A from nixCraft

How to change root password on Fedora Linux

last updated December 19, 2018 in Fedora Linux, Linux, User Management

I am a new user of Fedora Linux version 28/29 servers. I need to change the password for root user account on Fedora Linux server. How do I change the root password on Fedora Linux using command line options?

How to change root password on RHEL ( Red Hat Enterprise Linux)

last updated December 19, 2018 in Linux, RedHat and Friends, User Management

I am a new user of Red Hat Enterprise Linux servers. I need to change the password for root user account. How do I change the root password on RHEL ( Red Hat Enterprise Linux) using command line options?

How to create a user account on Ubuntu Linux

last updated November 24, 2018 in Amazon Cloud Computing, Linux, Ubuntu Linux, User Management

I have Ubuntu Linux 18.4 LTS server running on AWS cloud. How do I create a user account on Ubuntu Linux server using the command line?

userdel: user vivek is currently used by process 749 error and fix on Linux

last updated September 22, 2017 in CentOS, Debian / Ubuntu, Linux, Suse, User Management

I am trying to delete a user named vivek using the userdel command as follows

userdel -r vivek
userdel: user vivek is currently used by process 749

How do I fix this problem and delete username vivek on a Debian Linux 9.x server?

How to change root password in Ubuntu Linux

last updated December 2, 2018 in Linux, Ubuntu Linux

I am a new Ubuntu Linux server admin. How can I change root password in Ubuntu Linux server using the bash shell over ssh based session?

How to change root password on CentOS Linux

last updated December 19, 2018 in CentOS, Linux, User Management

I am a new user of CentOS Linux servers. I need to change the password for root user account on CentOS Linux. How do I change the root password on CentOS Linux using command line options?

How to force users to use secure passwords on Ubuntu/Debian Linux

last updated August 29, 2016 in Debian / Ubuntu, Linux, Security, User Management

My Linux shell user can modify their password using the passwd command. How can I force users to choose the secure password that will prevent users from using stupid passwords like “abc123”, “password”, “123456” and so on? How do I setup password quality requirements on my Debian or Ubuntu Linux server?