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unix shells

Comprehensive Analysis

1) "Unix" -- As to unix shells Filiation of Unix and Unix-like systems Unix (officially trademarked as UNIX®) is a computer operating system originally developed in the 1960s and 1970s by a group of AT&T employees at Bell Labs including Ken Thompson, Dennis Ritchie and Douglas McIlroy. Today's Unix systems are split into various branches, developed over time by AT&T as well as various commercial vendors and non-profit organizations. The present owner of the trademark UNIX® is The Open Group, an industry standards consortium. Only systems fully compliant with and certified to the Single UNIX Specification qualify as "UNIX®" (others are called "Unix system-like" or "Unix-like"). During the late 1970s and early 1980s, Unix's influence in academic circles led to large-scale adoption (particularly of the BSD variant, originating from the University of California, Berkeley) of Unix by commercial startups, the most notable of which is Sun Microsystems. Today, in addition to certified Unix systems, Unix-like operating systems such as Linux, Mac OS X and BSD derivatives are commonly encountered. Sometimes, Traditional Unix may be used to describe a Unix or an operating system that has the characteristics of either Version 7 Unix or UNIX System V. 1 Overview 2 History 2.1 1970s 2.2 1980s 2.3 1990s 2.4 2000 to present 3 Standards 4 Components 5 Impact 5.1 2038 6 Free Unix-like operating systems 7 Branding 8 Common Unix commands 9 References 2) "Shells" -- As to unix shells 1shell Pronunciation: 'shel Function: noun Etymology: Middle English, from Old English sciell; akin to Old English scealu shell, Old Norse skel, Lithuanian skelti to split, Greek skallein to hoe 1 a : a hard rigid usually largely calcareous covering or support of an animal b : the hard or tough often thin outer covering of an egg (as of a bird or reptile) -- see EGG illustration 2 : the covering or outside part of a fruit or seed especially when hard or fibrous 3 : shell material (as of mollusks or turtles) or their substance 4 : something that resembles a shell: as a : a framework or exterior structure; especially : a building with an unfinished interior b (1) : an external case or outside covering <the shell of a ship> (2) : a thin usually spherical layer or surface enclosing a space or surrounding an object <an expanding shell of gas around a neutron star> c : a casing without substance <mere effigies and shells of men -- Thomas Carlyle> d : an edible crust for holding a filling <a pastry shell> <a taco salad in a tortilla shell> e : BAND SHELL f : a small beer glass g : an unlined article of outerwear 5 : a shell-bearing mollusk 6 : an impersonal attitude or manner that conceals the presence or absence of feeling <he retreated into his shell> 7 : a narrow light racing boat propelled by one or more persons pulling oars or sculls 8 : any of the regions occupied by the orbits of a group of electrons of approximately equal energy surrounding the nucleus of an atom 9 a : Shell may refer to: Animal shell, such as that of a mollusc or turtle, egg, or a plant's nut Gastropod shell - animal shell of gastropods Electron shell, describing the structure of electron configuration in atoms Shell (computing), a type of computer user interface (for example a Unix or a DOS shell) Shell (mathematics), a ring-like algebraic structure, under two binary operations, including their respective units (in which the additive unit is also a multiplicative zero), but not necessarily satisfying the associativity of either operation, nor the distributive law of either operation over the other Shell (projectile), a projectile shot from a gun or artillery Shell sort, a sorting algorithm Racing shell, a rowed watercraft Royal Dutch Shell, Europe's largest energy corporation, or its U.S. affiliate Shell Oil Electron shells in atomic physics On shell and off shell, quantum field theory Art Shell, an American Football player and coach Big Shell, an offshore decontamination facility in the videogame Metal Gear Solid 2: Sons of Liberty Shell Canada, a Canadian oil company Shell Thropp, a character from revisionist Gregory Maguire's books Wicked and Son of a Witch. His role is larger in the latter book. Shell (theater) Thin-shell structure, a method of building construction Shell Turbo Chargers, a defunct basketball team in the Philippines "Shells" (Angel episode), an episode of the television series Angel ..." 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