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Version 7 Unix: /etc listing, showing init and rc Version 7 Unix: contents of an /etc/rc Bourne shell script. In Unix-based computer operating systems, init (short for initialization) is the first process started during booting of the operating system. Init is a daemon process that continues running
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: SysV init (a.k.a. simply "init") is similar to the Unix and BSD init processes, from which it
This is an accepted version of this page This is the latest accepted revision, reviewed on 23 February 2025. Family of Unix-like operating systems This article is about the family of operating systems. For the kernel, see Linux kernel. For other uses, see Linux (disambiguation). Operating system Linux Tux the penguin, the mascot of Linux Developer Community contributors, Linus Torvalds Written ...
The Open Group defines one option (-T, to specify the terminal type) and three keywords (init, clear and reset). Most implementations accept the name of a terminal capability together with any parameters that may be needed for that. However, some implementations expect a termcap name, while others expect a terminfo name.
As an integrated software suite, systemd replaces the startup sequences and runlevels controlled by the traditional init daemon, along with the shell scripts executed under its control. systemd also integrates many other services that are common on Linux systems by handling user logins, the system console, device hotplugging (see udev ...
After the Linux kernel has booted, the /sbin/init program reads the /etc/inittab file to determine the behavior for each runlevel. Unless the user specifies another value as a kernel boot parameter , the system will attempt to enter (start) the default runlevel.
OpenRC is a dependency-based init system for Unix-like computer operating systems.It was created by Roy Marples, a NetBSD developer who was also active in the Gentoo project. [3] [4] It became more broadly adopted as an init system outside of Gentoo following the decision by some Linux distributions not to adopt systemd.
daemontools is a process supervision toolkit written by Daniel J. Bernstein as an alternative to other system initialization and process supervision tools, such as Init. Some of the features of daemontools are: Easy service installation and removal; Easy first-time service startup; Reliable restarts; Easy, reliable signalling; Clean process ...