A daemon is:
Examples:
List all running daemons:
$ ps -C "$(xlsclients | cut -d' ' -f3 | paste - -s -d ',')" --ppid 2 --pid 2 --deselect -o tty,uid,pid,ppid,args | grep ^?
[https://unix.stackexchange.com/questions/175380/how-to-list-all-running-daemons](https://unix.stackexchange.com/questions/175380/how-to-list-all-running-daemons)
Option one, they are equivalent.
Option two, they are different.
Regardless of spelling, pronunciation, and whether good or evil, it is conceptually an invisible, ever-present agent doing stuff in the background.
It has been claimed that one inspiration for the concept in operating systems came from “Maxwell’s demon”, described by physicist James Maxwell in 1867, a demon that enforces the second law of thermodynamics.
In Linux, daemon is spelled with an a, and most geeks pronounce it “day-mon”.
Many daemons are servers, and most servers run as daemons. * daemon - refers to the process, and the way it is running. * server - refers to how the program functions as a component in a client-server architecture.
For example, I could run a server program from my terminal during development and testing, and then put it into production by setting it up to be started automatically at boot and run in the background. Only in the second case is the server running as a daemon.
Windows uses “service” to mean a daemon.
The word “service” can be used generally to refer to that which is provided by a server.
systemd now uses the term “service” to refer to a collection of resources, often including one or more daemons.
service is a linux system command, part of init or systemd-init, that can be used to run start and stop init scripts
$ type service service is hashed (/usr/sbin/service)
service, newer idea, a collection of daemons