Unix

Unix (trademarked as UNIX) is a family of multitasking, multiuser computer operating systems that derive from the original AT&T Unix, developed in the 1970s at the Bell Labs research center by Ken Thompson, Dennis Ritchie, and others.

Initially intended for use inside the Bell System, AT&T licensed Unix to outside parties from the late 1970s, leading to a variety of both academic and commercial variants of Unix from vendors such as the University of California, Berkeley (BSD), Microsoft (Xenix), IBM (AIX) and Sun Microsystems (Solaris). AT&T finally sold its rights in Unix to Novell in the early 1990s, which then sold its Unix business to the Santa Cruz Operation (SCO) in 1995, but the UNIX trademark passed to the industry standards consortium The Open Group, which allows the use of the mark for certified operating systems compliant with the Single UNIX Specification (SUS). Among these is Apple's OS X, which is the Unix version with the largest installed base as of 2014.

From the power user's or programmer's perspective, Unix systems are characterized by a modular design that is sometimes called the "Unix philosophy", meaning that the operating system provides a set of simple tools that each perform a limited, well-defined function, with a unified filesystem as the main means of communication and a shell scripting and command language to combine the tools to perform complex workflows. Aside from the modular design, Unix also distinguishes itself from its predecessors as the first portable operating system: almost the entire operating system is written in the C programming language that allowed Unix to reach numerous platforms.

Single UNIX Specification

The Single UNIX Specification (SUS) is the collective name of a family of standards for computer operating systems, compliance with which is required to qualify for to use the "UNIX" trademark. The core specifications of the SUS are developed and maintained by the Austin Group, which is a joint working group of IEEE, ISO JTC 1 SC22 and The Open Group. If an operating system is submitted to The Open Group for certification, and passes conformance tests, then it is termed to be compliant with a UNIX standard such as UNIX 98 or UNIX 03.

Very few BSD and Linux-based operating systems are submitted for compliance with the Single UNIX Specification, although system developers generally aim for compliance with POSIX standards, which form the core of the Single UNIX Specification.

History

1980s: Motivation

The SUS emerged from a mid-1980s project to standardize operating system interfaces for software designed for variants of the Unix operating system. The need for standardization arose because enterprises using computers wanted to be able to develop programs that could be used on the computer systems of different manufacturers without reimplementing the programs. Unix was selected as the basis for a standard system interface partly because it was manufacturer-neutral.

Year 2038 problem

The Year 2038 problem is an issue for computing and data storage situations in which time values are stored or calculated as a signed 32-bit integer, and this number is interpreted as the number of seconds since 00:00:00 UTC on 1 January 1970 ("the epoch"). Such implementations cannot encode times after 03:14:07 UTC on 19 January 2038 (21 years' time), a problem similar to but not entirely analogous to the "Y2K problem" (also known as the "Millennium Bug"), in which 2-digit values representing the number of years since 1900 could not encode the year 2000 or later. Most 32-bit Unix-like systems store and manipulate time in this "Unix time" format, so the year 2038 problem is sometimes referred to as the "Unix Millennium Bug" by association.

Technical cause

The latest time that can be represented in Unix's signed 32-bit integer time format is 03:14:07 UTC on Tuesday, 19 January 2038 (2,147,483,647 seconds after 1 January 1970). Times beyond that will "wrap around" and be stored internally as a negative number, which these systems will interpret as having occurred on 13 December 1901 rather than 19 January 2038. This is caused by integer overflow. The counter "runs out" of usable bits, "increments" the sign bit instead, and reports a maximally negative number (continuing to count up, toward zero). Resulting erroneous calculations on such systems are likely to cause problems for users and other relying parties.

Script

Script may refer to:

Computing

Media

Writing systems

Screenplay

A screenplay or script is a written work by screenwriters for a film, video game, or television program. These screenplays can be original works or adaptations from existing pieces of writing. In them, the movement, actions, expression, and dialogues of the characters are also narrated. A play for television is also known as a teleplay.

Format and style

The format is structured in a way that one page usually equates to one minute of screen time. In a "shooting script", each scene is numbered, and technical direction may be given. In a "spec" or a "draft" in various stages of development, the scenes are not numbered, and technical direction is at a minimum. The standard font for a screenplay is 12 point, 10 pitch Courier Typeface.

The major components are action and dialogue. The "action" is written in the present tense. The "dialogue" are the lines the characters speak. Unique to the screenplay (as opposed to a stage play) is the use of slug lines.

A slug line, also called a master scene heading, occurs at the start of every scene, and is usually made up of three parts. Part one states whether the scene is set inside (interior/INT.) outside (exterior/EXT.), or both. Part two states location of the scene. Part three, separated from Part two by a hyphen, refers to the time of the scene. Each slug line begins a new scene. In a shooting script, the slug lines are numbered consecutively. These scene numbers serve as mile-post markers in a script. This allows any part of the script to be referred to by scene number.

Script typeface

Script typefaces are based upon the varied and often fluid stroke created by handwriting. They are organized into highly regular formal types similar to cursive writing and looser, more casual scripts.

Formal scripts

A majority of formal scripts are based upon the letterforms of seventeenth and eighteenth century writing-masters like George Bickham, George Shelley and George Snell. The letters in their original form are generated by a quill or metal nib of a pen. Both are able to create fine and thick strokes. Typefaces based upon their style of writing appear late in the eighteenth century and early nineteenth century. Contemporary revivals of formal script faces can be seen in Kuenstler Script and Matthew Carter's typeface Snell Roundhand. These typefaces are frequently used for invitations and diplomas to effect an elevated and elegant feeling.

Casual scripts

Casual scripts show a less formal, more active hand. The strokes may vary in width but often appear to have been created by wet brush rather than a pen nib. They appear in the early twentieth century and with the advent of photocomposition in the early-1950s their number rapidly increased. They were popularly used in advertising in Europe and North America into the 1970s. Examples of casual script types include Brush Script, Kaufmann and Mistral.