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Annotation of 43BSDReno/usr.bin/su/su.1, revision 1.1

1.1     ! root        1: .\" Copyright (c) 1988, 1990 The Regents of the University of California.
        !             2: .\" All rights reserved.
        !             3: .\"
        !             4: .\" Redistribution and use in source and binary forms are permitted provided
        !             5: .\" that: (1) source distributions retain this entire copyright notice and
        !             6: .\" comment, and (2) distributions including binaries display the following
        !             7: .\" acknowledgement:  ``This product includes software developed by the
        !             8: .\" University of California, Berkeley and its contributors'' in the
        !             9: .\" documentation or other materials provided with the distribution and in
        !            10: .\" all advertising materials mentioning features or use of this software.
        !            11: .\" Neither the name of the University nor the names of its contributors may
        !            12: .\" be used to endorse or promote products derived from this software without
        !            13: .\" specific prior written permission.
        !            14: .\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
        !            15: .\" WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
        !            16: .\" MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            17: .\"
        !            18: .\"     @(#)su.1       6.11 (Berkeley) 6/24/90
        !            19: .\"
        !            20: .TH SU 1 "%Q"
        !            21: .UC
        !            22: .SH NAME
        !            23: su \- substitute user id
        !            24: .SH SYNOPSIS
        !            25: .nf
        !            26: .ft B
        !            27: su [ -Kflm ] [ login ]
        !            28: .ft R
        !            29: .nf
        !            30: .SH DESCRIPTION
        !            31: .I Su
        !            32: requests the Kerberos password for
        !            33: .I login
        !            34: (or for ``\fIlogin\fP.root'', if no login is provided), and switches to
        !            35: that user and group ID after obtaining a Kerberos ticket granting ticket.
        !            36: A shell is then invoked.
        !            37: .I Su
        !            38: will resort to the local password file to find the password for
        !            39: .I login
        !            40: if there is a Kerberos error.
        !            41: If
        !            42: .I su
        !            43: is executed by root, no password is requested and a shell
        !            44: with the appropriate user ID is invoked; no additional Kerberos tickets
        !            45: are obtained.
        !            46: .PP
        !            47: By default, the environment is unmodified with the exception of
        !            48: .IR USER ,
        !            49: .IR HOME ,
        !            50: and
        !            51: .IR SHELL .
        !            52: .I HOME
        !            53: and
        !            54: .I SHELL
        !            55: are set to the target login's default values.
        !            56: .I USER
        !            57: is set to the target login, unless the target login has a user ID of 0,
        !            58: in which case it is unmodified.
        !            59: The invoked shell is the target login's.
        !            60: This is the traditional behavior of
        !            61: .IR su .
        !            62: .PP
        !            63: The options are as follows:
        !            64: .TP
        !            65: \-K
        !            66: Do not attempt to use Kerberos to authenticate the user.
        !            67: .TP
        !            68: \-f
        !            69: If the invoked shell is
        !            70: .IR csh (1),
        !            71: this option prevents it from reading the ``.cshrc'' file.
        !            72: .TP
        !            73: \-l
        !            74: Simulate a full login.
        !            75: The environment is discarded except for
        !            76: .IR HOME ,
        !            77: .IR SHELL ,
        !            78: .IR PATH ,
        !            79: .IR TERM ,
        !            80: and
        !            81: .IR USER .
        !            82: .I HOME
        !            83: and
        !            84: .I SHELL
        !            85: are modified as above.
        !            86: .I USER
        !            87: is set to the target login.
        !            88: .I PATH
        !            89: is set to ``/bin:/usr/bin''.
        !            90: .I TERM
        !            91: is imported from your current environment.
        !            92: The invoked shell is the target login's, and
        !            93: .I su
        !            94: will change directory to the target login's home directory.
        !            95: .TP
        !            96: \-m
        !            97: Leave the environment unmodified.
        !            98: The invoked shell is your login shell, and no directory changes are made.
        !            99: As a security precaution, if the target user's shell is a non-standard
        !           100: shell (as defined by \fIgetusershell\fP(3)) and the caller's real uid is
        !           101: non-zero,
        !           102: .I su
        !           103: will fail.
        !           104: .PP
        !           105: The \-l and \-m options are mutually exclusive; the last one specified
        !           106: overrides any previous ones.
        !           107: .PP
        !           108: Only users in group 0 (normally ``wheel'') can
        !           109: .I su
        !           110: to ``root''.
        !           111: .PP
        !           112: By default (unless the prompt is reset by a startup file) the super-user
        !           113: prompt is set to ``#'' to remind one of its awesome power.
        !           114: .SH "SEE ALSO"
        !           115: csh(1), login(1), sh(1), kinit(1), kerberos(1), passwd(5), group(5), environ(7)

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