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Wheel (Unix term)
In computing, the term wheel refers to a user account with a ''wheel bit'', a system setting that provides additional special system privileges that empower a user to execute restricted commands that ordinary user accounts cannot access.〔 The term is derived from the slang phrase ''big wheel'', referring to a person with great power or influence.〔 It was first used in this context with regard to the TENEX operating system, later distributed under the name TOPS-20 in the 1960s and early 1970s.
The term was adopted by Unix users in the 1980s, due to the movement of operating system developers and users from TENEX/TOPS-20 to Unix.〔 Modern Unix implementations generally include a security protocol that requires a user to be a member of the ''wheel'' user privileges group in order to gain superuser access to a machine by using the su command.〔〔
== Wheel group ==
Modern Unix systems use user groups to control access privileges. The wheel group is a special user group used on some Unix systems to control access to the su command, which allows a user to masquerade as another user (usually the super user).
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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