su


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SU

(nucleonics)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

su

(operating system, tool, security)
(substitute user) The Unix command which allows you to become another user after entering their password. su is most often used without arguments in which case it defaults to user root. Some versions of Unix only allows this command to be used by members of the wheel group.

Unix manual page: su(1).
This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)