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A kernel is a component of a computer operating system. [1] A comparison of system kernels can provide insight into the design and architectural choices made by the developers of particular operating systems.
This is an accepted version of this page This is the latest accepted revision, reviewed on 3 March 2025. List of software distributions using the Linux kernel This article has multiple issues. Please help improve it or discuss these issues on the talk page. (Learn how and when to remove these messages) This article relies excessively on references to primary sources. Please improve this ...
Multiserver Microkernel (Hurd kernel) or Monolithic (Linux-libre kernel, fork of Linux kernel, and other kernels which are not part of the GNU Project) C: 1:1 Unix-like: 2.4 on Linux-libre kernel (not on Hurd kernel) Linux: ReactOS: GPL, LGPL Hybrid C, C++ Windows-like: No RISC OS: Apache 2.0 Monolithic (with cooperative multitasking) ARM ...
The Linux kernel is a free and open source, [11]: 4 Unix-like kernel that is used in many computer systems worldwide. The kernel was created by Linus Torvalds in 1991 and was soon adopted as the kernel for the GNU operating system (OS) which was created to be a free replacement for Unix.
Source code (e.g., the kernel source code with its header files). /usr/X11R6: X Window System, Version 11, Release 6 (up to FHS-2.3, optional). /var: Variable files: files whose content is expected to continually change during normal operation of the system, such as logs, spool files, and temporary e-mail files. /var/cache: Application cache data.
The Linux operating system is based on this kernel and deployed on both traditional computer systems such as personal computers and servers, usually in the form of Linux distributions (including Ubuntu and its derivatives), and on various embedded devices such as routers, wireless access points, PBXes, set-top boxes, FTA receivers, smart TVs ...
Linux kernel boot and decompression process. vmlinux is a statically linked executable file that contains the Linux kernel in one of the object file formats supported by Linux, which includes Executable and Linkable Format (ELF) and Common Object File Format (COFF).
The character between the address and the symbol (separated by spaces) is the type of a symbol. The nm utility program on Unix systems lists the symbols from object files. The System.map is directly related to it, in that this file is produced by nm on the whole kernel program – just like nm lists the symbols and their types for any small object programs.