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Traditionally, the process names of a daemon end with the letter d, for clarification that the process is in fact a daemon, and for differentiation between a daemon and a normal computer program. For example, syslogd is a daemon that implements system logging facility, and sshd is a daemon that serves incoming SSH connections.
Web server daemon. inetd [4] Listens for network connection requests. If a request is accepted, it can launch a background daemon to handle the request, was known as the super server for this reason. Some systems use the replacement command xinetd. lpd: The line printer daemon that manages printer spooling. nfsd [3]
On this account, the other traditional notion of the daemon as related to the souls of the dead is elided in favour of a spatial scenario which evidently also graduated in moral terms; though [Plato] says nothing of that here, it is a necessary inference from her account, just as Eros is midway between deficiency and plenitude. ...
When you get a message from a "MAILER-DAEMON" or a "Mail Delivery Subsystem" with a subject similar to "Failed Delivery," this means that an email you sent was undeliverable and has been bounced back to you. These messages are sent automatically and often include the reason for the delivery failure.
A daemon is a type of background process designed to run continually in the background, waiting for event(s) to occur or condition(s) to be met. [9] When launched with the daemon function, daemons are disassociated from their parent terminal.
systemd is the first daemon to start during booting and the last daemon to terminate during shutdown. The systemd daemon serves as the root of the user space's process tree; the first process (PID 1) has a special role on Unix systems, as it replaces the parent of a process when the original parent terminates. Therefore, the first process is ...
Examples are querying of network equipment using SNMP or execution of custom programs or scripts. So called "write plug-ins" offer the possibility to store the collected data on disk using RRD- or CSV-files, or to send data over the network to a remote instance of the daemon.
NetworkManager is a daemon that sits on top of libudev and other Linux kernel interfaces (and a couple of other daemons) and provides a high-level interface for the configuration of the network interfaces.