> Date: Sunday, October 23, 2016 19:51:02 +0800 > From: Xuwen Fang <fxuwen at gmail.com> > To: CentOS mailing list <centos at centos.org> > > Hello everyone, > > I added my user account to a group called "www-pub" for easier > manipulations on web files on my server. And today I found that my > account was not in the group "www-pub" any longer..... > What I did to add my account to the group is like "sudo usermod -a > -G www-pub myaccount". Is there anything wrong? > > Thanks for any suggestions. > > Sincerely, > Xuwen After issuing that command did you check the /etc/group and /etc/gshadow files to confirm that the command was successful? And, have you looked there now? Have you checked/compared the system-generated "~" backups? Assuming you were successfully added, and the entries aren't there now, have reviewed the /var/log/secure log for subsequent actions that would have reversed that? [realizing of course that the password and group files can be hand-edited.] What are the modified timestamps on those two group files (and their system-generated backups) relative to when you issued that command?