Unix operating system detailed

UNIX, is a powerful multi-user, multi-tasking operating system, supports a variety of processor architecture, according to the classification of the operating system, belongs to the time-sharing operating system, first by KenThompson, DennisRitchie and DouglasMcIlroy in 1969 Developed at AT&T's Bell Labs. Currently its trademark rights are owned by The Open Group.

What are the versions of the UNIX operating system?

AIX (Advanced Interactive eXecutive) is a UNIX operating system developed by IBM. It complies with Open Group's UNIX 98 Base Brand, which provides comprehensive scalability for these applications through full integration of parallel operation support for 32-bit and 64-bit applications. It runs on all IBM ~ p-series and IBM RS/6000 workstations, servers, and large parallel hypercomputers
. Some popular features of AIX such as the chuser, mkuser, rmuser commands, and the like allow for user management just like managing files. AIX-level logical volume management is gradually being added to various free UNIX-style operating systems.

Solaris is a Unix-like operating system developed by Sun. The latest version is Solaris 11. Early Solaris was developed from BSDUnix. This is because one of the founders of Sun Microsystems, Bill · Bill Joy comes from the University of California at Berkeley. But over time, Solaris is now moving closer to System V on the interface. Solaris is still a proprietary software. On June 14, 2005, Sun's source code for Solaris 11 under development was opened under the CDDL license. This open version is OpenSolaris. Sun's operating system was originally called SunOS. At the beginning of SunOS 5.0, Sun's operating system development began to turn to System V 4, and a new name called Solaris 2.0; after Solaris 2.6, SUN deleted the "2 in the version number, therefore, SunOS 5.10 is called Solaris 10. Earlier versions of Solaris were later renamed to Solaris 1.x. So the term "SunOS" is used to refer to the kernel of the Solaris operating system, so Solaris is considered to be a graphical desktop computing environment by SunOS, and it Network
Enhanced components. Solaris runs on two platforms: Intel x86 and SPARC/UltraSPARC. The latter is the processor used by the Sun workstation. As a result, Solaris has strong processing power and hardware support on SPARC, and performance on Intel x86 is improving. For both platforms, Solaris shields the underlying platform differences and provides users with the same possible experience.

HP-UX (from Hewlett Packard UniX) is a UNIX-like operating system developed by HP Technologies (Hewlett-Packard) based on SystemV. HP-UX can run on HP's PA-RISC processor, Intel's Itanium processor

, and in the past it can also be used in later Apollo computers (Apollo/Domain) ) on the system. Earlier versions of HP-UX can also be used on HP 9000 Series 200, 300, and 400 computer systems (using Motorola's 68000 processor) and HP-9000 Series 500 computers (using HP's proprietary FOCUS processing). Architecture).

IRIX is a UNIX operating system developed by Silicon Graphics Inc. (SGI) based on System V and BSD extension programs. IRIX can be used in SGI. The company's RISC-type computer runs on SGI workstations and servers with 32-bit and 64-bit MIPS architectures.

Xenix is ​​a UNIX operating system that can be used on personal computers and microcomputers. The system was licensed by Microsoft Corporation in 1979 from AT&T and developed for Intel processors. Later, SCO acquired its exclusive use rights, and since then, the company has begun to sell under the name SCO UNIX (also known as SCO OpenServer). It is worth mentioning that it can also run on the DECPDP-11 or Apple Lisa computer. It inherits the features of UNIX. Xenix has a multi-tasking multi-tasking working environment that conforms to the UNIX System V interface specification (SVID).

A/UX (from Apple Unix) is a UNIX operating system developed by Apple Computer, which can be used in some of the company's Macintosh computers. Running on the Macintosh), the last (or latest) set of A/UX runs on computers such as the Macintosh II, Quadra and Centris. A/UX was first published in 1988, and the final version was version 3.1.1, which was published in 1995. A/UX requires at least one 68k processor with a floating point unit and a paged memory management unit (PMMU) to run.

A/UX is based on System V version 2.2 and also uses the traditional features of System V 3 (SysV 3), System V 4, BSD 4.2, BSD 4.3, etc. The POSIX specification and the SVID specification, but it is difficult to support the latest information technology following the standard version, so the second edition will begin to join the TCP/IP network function. There are rumors that there is a follow-up version based on OSF/1, but it has never been published, but there is no way to confirm whether this version really exists.