BSD 2.11 - man page for su (bsd section 1)
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su - substitute user id temporarily
su [ -f ] [ - ] [ userid ]
Su demands the password of the specified userid, and if it is given, changes to that
userid and invokes the Shell sh(1) or csh(1) without changing the current directory. The
user environment is unchanged except for HOME and SHELL, which are taken from the password
file for the user being substituted (see environ(7)). The new user ID stays in force
until the Shell exits.
If no userid is specified, ``root'' is assumed. Only users in the ``wheel'' group (group
0) can su to ``root'', even with the root password. To remind the super-user of his
responsibilities, the Shell substitutes `#' for its usual prompt.
The -f option prevents csh(1) from executing the .cshrc file; thus making su start up
The - option simulates a full login.
3rd Berkeley Distribution May 5, 1986 SU(1)
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