/etc/shadow – nixCraft

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

August 28, 2016August 29, 2016in Debian / Ubuntu, Linux, Security, User Management last updated August 29, 2016

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?

Linux Change Password

December 6, 2010July 29, 2013in BASH Shell, Commands, Linux last updated July 29, 2013

How do I change my own password as well as the passwords of other users as required under Linux operating system without using GUI systems? How can I change or set user password on Linux operating systems?

Ubuntu: Rename an Account [ User ID ]

December 6, 2010December 6, 2010in Ubuntu Linux last updated December 6, 2010

How do I rename a user name from ‘tom’ to ‘jerry’ under Ubuntu Linux?

Linux Upgrade Password Hashing Algorithm to SHA-512

November 10, 2009November 12, 2009in CentOS, Linux, RedHat and Friends, Security, User Management last updated November 12, 2009

The default algorithm for storing password hashes in /etc/shadow is MD5. I was told to use SHA-512 hashing algorithm. How do I set password hashing using the SHA-256 and SHA-512 under CentOS or Redhat Enterprise Linux 5.4?