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Dictionary :: Letter U

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Unix

By the most simple definition, UNIX ( yoo-niks) is a computer operating system - the base software that controls a computer system and its peripherals. In this sense, UNIX behaves in the same way that the perhaps more familiar PC operating systems Windows or MacOS behave. It provides the base mechanisms for booting a computer, logging in, running applications, storing and retrieving files, etc.

More specificially, the word "UNIX" refers to a family of operating systems that are related to one or both of the original UNIX operating systems - BSD and SystemV. Examples of modern UNIX operating systems include IRIX (from SGI), Solaris (from Sun), Tru64 (from Compaq) and Linux (from the Free Software community). Even though these different "flavors" of UNIX have unique characteristics and come from different sources, they all work alike in a number of fundamental ways. If you gain familiarity with any one of these UNIX-based operating systems, you will also have gained at least some familiarity with nearly every other variant of UNIX.

Last Revised: 2015-07-01

Unix Time

Unix time (also known as POSIX time or Epoch time) is defined as the number of seconds that have elapsed since 00:00:00 Coordinated Universal Time (UTC), Thursday, 1 January 1970, not counting leap seconds. Since Unix time does not change no matter where you are located on the globe, it is very useful to computer systems for tracking and sorting dated information in dynamic and distributed applications both online and client side.

Last Revised: 2015-10-08

URL

URL or Uniform Resource Locator is the address of a page. For example: https://www.password-sentry.com/. It tells you the protocols (http:// or https:// or ftp://), path to the requested page or file, and the page's or file's name. You can see the address of whatever page you're reading by looking in the address bar in your browser.

Last Revised: 2015-07-01

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