In Linux, the
useradd is a command in Linux that is used to add user accounts to your system. The ‘
useradd‘ command is a low-level utility that is used for adding/creating user accounts in Linux and other Unix-like operating systems. The ‘
adduser‘ is much similar to the useradd command because it is just a symbolic link to it. Only root or users with sudo privileges can use the useradd command to create new user accounts. When invoked,
useradd create a new user account according to the options specified on the command line and the default values set in the
/etc/default/useradd file. You can find other guides here :Practical-use-of-SELinux-in-production-how-to-locate-directory-file-context-and-restore-it-with-selinux/, how to create-a-static-pod-in-Kubernetes-with-demos-that-can-help-you-become-a-better-kubernetes-administrator and how to create-and-deliver-a-report-on-system-utilization-on-a-Linux-based-os/.
I previously had a user created in my centOS environment. This user was later deleted and I tried creating a new user with the same name, then this error was prompted. See the image below for more information.
This is actually not an error but just a warning and what this means is.
– Note: Windows does not work like this 🙂 when you delete a user, the user, and the SID is gone unless the user account is recovered.
But in Linux, the home directory is not immediately deleted. All files etc. will still be able for a while. When the system finally deletes the user, the account can be created again.
Note: In windows, when a user is deleted, and a new user is created, a new SID is assigned. This is also the case in Linux as gid and groups id are now different for john as shown below.
I hope you found this blog post helpful. If you have any questions, please let me know in the comment session.