Glossary

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U
U. S. Controlled Facility
U. S. -Controlled Facility
U. S. Controlled Space
U. S. -Controlled Space
U. S. Nongovernmental Source
U. S. Person
UA
UBD
UDP datagram
UDP port scanning
UID (User ID)
UIRK
UIS
UK
Umask
UN*X
Unapproved Software
Unauthorized Disclosure
Unauthorized Disclosure Of Information
Unauthorized Modification
Unauthorized User
Unavailability
Unbundling
Uncertainty Calculus
Unclassified
Unclassified Controlled Nuclear Information
Unclassified Information
Unclassified Telecommunications Security
Uncontrolled Access Area
Undefined External Reference
Under The Hood
Underlap
Undesired Signal Data Emanations
Undocumented Feature
UNICODE directory traversal attack
Uniform Encoding
Uniformed security personnel
Uninteresting
Unit Element
Unit Interval
UNIX
UNIX Brain Damage
UNIX Conspiracy
UNIX Weenie
UNIX:
Unixism
Unnecessary services
Unnumbered Command
Unnumbered Response
Unprivileged User
Unprotect
Unprotected
Unreliable
Unsuccessful Call
Unswizzle
Untrusted Applications
Untrusted Element
Untrusted network
Untrusted Process
Unwind The Stack
Unwind-Protect
Up
Up-Converter
Update
Updating
Upgrade
Upgrade Parameter
Uplink
Upload
UPP
Upthread
Uptime
Urchin
URL
URL filtering
Usable Line Length
Usage
Use policy
Useful Line
Usenet
User
User Datagram Protocol (UDP)
User ID
User ID (UID)
User Identification
User Information
User Information Bit
User Information Block
User Partnership Program
User Profile
User/process Interface
User-Obsequious
USG UNIX
Utility Program
Utility Routine
UTSL
UUCPNET
UV
UNIX:
  • /yoo'niks/ n. [In the authors' words, "A weak pun on Multics"] (also `Unix') An interactive time-sharing system invented in 1969 by Ken Thompson after Bell Labs left the Multics project, originally so he could play games on his scavenged PDP-7. Dennis Ritchie, the inventor of C, is considered a co-author of the system. The turning point in UNIX's history came when it was reimplemented almost entirely in C during 1972--1974, making it the first source-portable OS. UNIX subsequently underwent mutations and expansions at the hands of many different people, resulting in a uniquely flexible and developer-friendly environment. By 1991, UNIX had become the most widely used multiuser general-purpose operating system in the world. Many people consider this the most important victory yet of hackerdom over industry opposition (but see UNIX weenie and UNIX conspiracy for an opposing point of view). See Version 7, BSD, USG UNIX. Some people are confused over whether this word is appropriately `UNIX' or `Unix'; both forms are common, and used interchangeably. Dennis Ritchie says that the `UNIX' spelling originally happened in CACM's 1973 paper because "we had a new typesetter and troff had just been invented and we were intoxicated by being able to produce small caps. " Later, dmr tried to get the spelling changed to `Unix' in a couple of Bell Labs papers, on the grounds that the word is not acronymic. He failed, and eventually (his words) "wimped out" on the issue. So both capitalizations are grounded in ancient usage.