08-16-2017
The user group zero is reserved for privileged accounts, namely root. And you have to be root to use the userdel command. That is the direct cause of the error, I think.
I'm not sure how to fix your problem. When you need special privileges for a user there are special tools like sudoer (sudo), which allows you to give good control over what the user can and cannot do. Do not fiddle around with reserved group numbers like that.
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LEARN ABOUT REDHAT
userdel
USERDEL(8) System Manager's Manual USERDEL(8)
NAME
userdel - Delete a user account and related files
SYNOPSIS
userdel [-r] login
DESCRIPTION
The userdel command modifies the system account files, deleting all entries that refer to login. The named user must exist. The options
which apply to the userdel command are:
-r Files in the user's home directory will be removed along with the home directory itself and the user's mail spool. Files located in
other file systems will have to be searched for and deleted manually.
FILES
/etc/passwd - user account information
/etc/shadow - secure user account information
/etc/group - group information
CAVEATS
userdel will not allow you to remove an account if the user is currently logged in. You must kill any running processes which belong to an
account that you are deleting. You may not remove any NIS attributes on an NIS client. This must be performed on the NIS server.
SEE ALSO
chfn(1), chsh(1), passwd(1), groupadd(8), groupdel(8), groupmod(8), useradd(8), usermod(8)
AUTHOR
Julianne Frances Haugh (jockgrrl@ix.netcom.com)
USERDEL(8)