Virtual users for vsftpd

I played around with my server recently. Among other things, I set up my vsftpd installation to use virtual users. I use Gentoo Linux, but I think the way I did it will also work with any other Linux distribution.

I added the entry Virtual users for vsftpd to my Linux Know How and also released a small program called userdbadm I wrote to manage the PAM userdb I needed to get it all to work.

Perhaps, somebody needs this :-)