system accounts HowTo - Linux / Unix Q & A from nixCraft

Linux Change or Rename User Name and UID (user-id)

last updated January 11, 2019 in CentOS, Debian / Ubuntu, Linux, RedHat and Friends, Suse, User Management

How do I change user name (rename user name) or UID under a Linux operating system using command line tools?

Understanding /etc/passwd File Format

last updated August 2, 2017 in Linux, Linux / UNIX File Formats, UNIX

Can you explain /etc/passwd file format for Linux and Unix-like operating systems?