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32 .\" from: @(#)su.1 6.12 (Berkeley) 7/29/91
33 .\" $Id: su.1,v 1.3 1996/02/11 23:56:09 d91-jda Exp $
40 .Nd substitute user identity
44 .Op Ar login Op Ar "shell arguments"
47 requests the Kerberos password for
50 .Dq Ar login Ns .root ,
51 if no login is provided), and switches to
52 that user and group ID after obtaining a Kerberos ticket granting ticket.
53 A shell is then executed, and any additional
56 are passed to the shell.
58 will resort to the local password file to find the password for
60 if there is a Kerberos error.
63 is executed by root, no password is requested and a shell
64 with the appropriate user ID is executed; no additional Kerberos tickets
67 Alternately, if the user enters the password "s/key", they will be
68 authenticated using the S/Key one-time password system as described in
70 S/Key is a Trademark of Bellcore.
72 By default, the environment is unmodified with the exception of
80 are set to the target login's default values.
82 is set to the target login, unless the target login has a user ID of 0,
83 in which case it is unmodified.
84 The invoked shell is the target login's.
85 This is the traditional behavior of
88 The options are as follows:
91 Do not attempt to use Kerberos to authenticate the user.
93 If the invoked shell is
95 this option prevents it from reading the
99 Simulate a full login.
100 The environment is discarded except for
110 are modified as above.
112 is set to the target login.
115 .Dq Pa /bin:/usr/bin .
117 is imported from your current environment.
118 The invoked shell is the target login's, and
120 will change directory to the target login's home directory.
122 Leave the environment unmodified.
123 The invoked shell is your login shell, and no directory changes are made.
124 As a security precaution, if the target user's shell is a non-standard
127 and the caller's real uid is
132 If the kerberos root instance is not root any other value can be passed
140 options are mutually exclusive; the last one specified
141 overrides any previous ones.
143 Only users mentioned in
145 (or in group 0 when not doing kerberos) can
150 By default (unless the prompt is reset by a startup file) the super-user
153 to remind one of its awesome power.
165 Environment variables used by
169 Default home directory of real user ID unless modified as
172 Default search path of real user ID unless modified as specified above.
174 Provides terminal type which may be retained for the substituted
177 The user ID is always the effective ID (the target user ID) after an
179 unless the user ID is 0 (root).
186 The version described
187 here is an adaptation of the
189 Athena Kerberos command.