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Components of some Linux desktop environments that are daemons include D-Bus, NetworkManager (here called unetwork), PulseAudio (usound), and Avahi.. In multitasking computer operating systems, a daemon (/ ˈ d iː m ən / or / ˈ d eɪ m ən /) [1] is a computer program that runs as a background process, rather than being under the direct control of an interactive user.
Provides a network interface for the finger protocol, as used by the finger command. ftpd [1] Services FTP requests from a remote system. httpd: 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.
The init system is the first daemon to start (during booting) and the last daemon to terminate (during shutdown). Historically this was the "SysV init", which was just called "init". More recent Linux distributions are likely to use one of the more modern alternatives such as systemd. Below is a summary of the main init processes:
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 ...
runit is an init and service management scheme for Unix-like operating systems that initializes, supervises, and ends processes throughout the operating system.Runit is a reimplementation of the daemontools [3] process supervision toolkit that runs on many Linux-based operating systems, as well as BSD, and Solaris operating systems.
In most Linux distributions, the full list of possible options and their description is accessible with a "man xinetd.conf" command. To apply the new configuration, a SIGHUP signal must be sent to the xinetd process to make it re-read the configuration files. This can be achieved with the following command: kill -SIGHUP "PID".
A system installer is the software that is used to set up and install an operating system onto a device. Windows Setup is the system installer of Microsoft Windows. Examples of Linux system installers: Anaconda: used by CentOS, Fedora; Calamares: used by multiple Linux distributions (incl. some Ubuntu flavors, Debian, and derivates)
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.