addamax amigaos application programming interface assembly language association for computing machinery austin group beos bell labs berkeley software distribution berkeley sockets bill joy bourne shell brian kernighan burroughs large systems cpu modes c shell client-server common open software environment comparison of operating systems computer chronicles computer multitasking computer network computer networking computer terminal context switch copyright coroutine dennis ritchie desktop computer device driver digital equipment corporation douglas mcilroy dragonfly bsd eqn esau executable and linkable format exokernel file locking file system filesystem hierarchy standard freebsd free software free software movement gnu gnu compiler collection gnu general public license gnu hurd gnu toolchain general electric general protection fault genericized trademark gentoo linux ghostscript graphical user interface hp-ux hardware abstraction layer high-level programming language history of operating systems hybrid kernel ibm ipc irix intel corporation inter-process communication internet internet protocol interrupt ioctl job control language joe ossanna john lions kludge latin linus torvalds linux linux kernel list of unix systems list of unix utilities loadable kernel module lynxos minix ms-dos mac os x magnetic tape data storage mainframe computer mandriva linux massachusetts institute of technology memory protection memory segmentation mess of pottage message queue microkernel microsoft microsoft windows monolithic kernel multi-user multics next netbsd novell nroff openbsd opengl opensuse opensolaris open directory project open software foundation open source operating system operating system development posix paging patent pic language plain text porting postscript preboot execution environment programming tool protected mode qnx reactos red hat enterprise linux remote file system research unix reusability richard stallman roff sco-linux controversies sco openserver streams suse linux santa cruz operation schillix security segmentation fault shared memory shell script sign bit single unix specification slander of title small caps software engineering sunos sun microsystems system call system time tbl tex text editor the open group time-sharing time t timeline of operating systems trademark transport layer interface troff trusted operating system typesetting unix system iii unix system v usenix uucp ubuntu university of new south wales university of wollongong unix-like unixware unix domain socket unix philosophy unix shell unix time unix wars user space vax vi virtual file system virtual tape library vxworks western electric wikibooks windows nt workstation x x window system xbiff xenix zfs