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Unix Version 7 - man page for su (v7 section 1)

SU(1)					       General Commands Manual						SU(1)

NAME
su - substitute user id temporarily
SYNOPSIS
su [ userid ]
DESCRIPTION
Su demands the password of the specified userid, and if it is given, changes to that userid and invokes the Shell sh(1) without changing the current directory or the user environment (see environ(5)). The new user ID stays in force until the Shell exits. If no userid is specified, `root' is assumed. To remind the super-user of his responsibilities, the Shell substitutes `#' for its usual prompt.
SEE ALSO
sh(1) SU(1)


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