I've noticed that a lot of the packages I've been installing on my Ubuntu machine has this d at the end.  Googling it doesn't give me any answers that I can find.For example: FTP server - Package called: pure-ftpdTFTP server - Package called: atftpdSSH server - Package called: sshdWhat's up with this d?
What does the d mean after linux packages?
linux;packages;ubuntu
d is for demon or daemon in this case.Those packages are the background processes that handle the various connections (FTP, TFTP, SSH) mentioned.As a hint, the name of the package (__ server) indicates you're likely going to need a background process running to provide that service.And here's the Wikipedia quote on daemonIn multitasking computer operating systems, a daemon (/demn/ or /dimn/)[1] is a computer program that runs as a background process, rather than being under the direct control of an interactive user. Traditionally daemon names end with the letter d: for example, syslogd is the daemon that implements the system logging facility and sshd is a daemon that services incoming SSH connections.