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If you added the users simply to give them ftp access, then you can use `userdel' to remove them.
You might want to look at adding a shell option to useradd such as "-s /bin/false" or "-s /bin/nologin" so they don't gain shell access.
Another option you could look at are the "userlist_enable" and "userlist_deny" options.
The vsftpd.conf manpage gives details, but I would experiment first. There might be a typo in the manpage. I'm not clear what happens if "userlist_enable yes" and "userlist_deny no" are used.
I think that you could then maintain a list of users allowed access and control access using the list.
I think that "userlist_enable yes" and "userlist_deny yes" would allow you to do what you are doing but add users to the userlist to deny them ftp access.
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