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<html xmlns="http://www.w3.org/1999/xhtml"><head><title>operating system</title><link rel="stylesheet" href="../../jargon.css" type="text/css"/><meta name="generator" content="DocBook XSL Stylesheets V1.61.0"/><link rel="home" href="../index.html" title="The Jargon File"/><link rel="up" href="../O.html" title="O"/><link rel="previous" href="open-switch.html" title="open switch"/><link rel="next" href="operator-headspace.html" title="operator headspace"/></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">operating system</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="open-switch.html">Prev</a><EFBFBD></td><th width="60%" align="center">O</th><td width="20%" align="right"><EFBFBD><a accesskey="n" href="operator-headspace.html">Next</a></td></tr></table><hr/></div><dt><a id="operating-system"/><dt xmlns="" id="operating-system"><b>operating system</b>: <span xmlns="http://www.w3.org/1999/xhtml" class="grammar">n.</span></dt></dt><dd><p> [techspeak] (Often abbreviated &#8216;OS&#8217;) The foundation
software of a machine; that which schedules tasks, allocates storage, and
presents a default interface to the user between applications. The
facilities an operating system provides and its general design philosophy
exert an extremely strong influence on programming style and on the
technical cultures that grow up around its host machines. Hacker folklore
has been shaped primarily by the <a href="../U/Unix.html"><i class="glossterm">Unix</i></a>,
<a href="../I/ITS.html"><i class="glossterm">ITS</i></a>, <a href="../T/TOPS-10.html"><i class="glossterm">TOPS-10</i></a>,
<a href="../T/TOPS-20.html"><i class="glossterm">TOPS-20</i></a>/<a href="../T/TWENEX.html"><i class="glossterm">TWENEX</i></a>,
<a href="../W/WAITS.html"><i class="glossterm">WAITS</i></a>, <a href="../C/CP-M.html"><i class="glossterm">CP/M</i></a>,
<a href="../M/MS-DOS.html"><i class="glossterm">MS-DOS</i></a>, and <a href="../M/Multics.html"><i class="glossterm">Multics</i></a> operating
systems (most importantly by ITS and Unix). See also
<a href="../T/timesharing.html"><i class="glossterm">timesharing</i></a>.</p></dd><div class="navfooter"><hr/><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="open-switch.html">Prev</a><EFBFBD></td><td width="20%" align="center"><a accesskey="u" href="../O.html">Up</a></td><td width="40%" align="right"><EFBFBD><a accesskey="n" href="operator-headspace.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">open switch<63></td><td width="20%" align="center"><a accesskey="h" href="../index.html">Home</a></td><td width="40%" align="right" valign="top"><EFBFBD>operator headspace</td></tr></table></div></body></html>