2007-10-07 17:14:02 +05:30
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.\" Copyright 1989 - 1990, Julianne Frances Haugh
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of Julianne F. Haugh nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY JULIE HAUGH AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL JULIE HAUGH OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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2007-10-07 17:14:14 +05:30
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.\" $Id: su.1,v 1.6 2000/08/26 18:27:17 marekm Exp $
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2007-10-07 17:14:02 +05:30
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.\"
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.TH SU 1
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.SH NAME
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su \- Change user ID or become super-user
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.SH SYNOPSIS
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.BR su " [" - ]
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.RI [ username " [" args ]]
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.SH DESCRIPTION
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.B su
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is used to become another user during a login session.
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Invoked without a username, \fBsu\fR defaults to becoming
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the super user.
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The optional argument \fB\-\fR may be used to provide an
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environment similiar to what the user would expect had
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the user logged in directly.
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.PP
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Additional arguments may be provided after the username,
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in which case they are supplied to the user\'s login shell.
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In particular, an argument of \fB-c\fR will cause the
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next argument to be treated as a command by most command
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interpreters.
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.\" The command will be executed under the shell specified by
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.\" \fB$SHELL\fR, or if undefined, by the one specified in
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.\" \fI/etc/passwd\fR.
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.\" XXX - the above was not quite correct. --marekm
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The command will be executed by the shell specified in
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\fI/etc/passwd\fR for the target user.
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.PP
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The user will be prompted for a password, if appropriate.
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Invalid passwords will produce an error message.
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All attempts, both valid and invalid, are logged to detect
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abuses of the system.
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.PP
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The current environment is passed to the new shell. The value of
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\fB$PATH\fR is reset to \fB/bin:/usr/bin\fR for normal users, or
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\fB/sbin:/bin:/usr/sbin:/usr/bin\fR for the super user. This may be
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changed with the \fBENV_PATH\fR and \fBENV_SUPATH\fR definitions in
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\fI/etc/login.defs\fR.
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2007-10-07 17:14:14 +05:30
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.PP
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A subsystem login is indicated by the presense of a "*" as the first
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character of the login shell. The given home directory will be used as
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the root of a new filesystem which the user is actually logged into.
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2007-10-07 17:14:02 +05:30
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.SH CAVEATS
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.PP
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This version of \fBsu\fR has many compilation options, only some of which
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may be in use at any particular site.
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.SH Files
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/etc/passwd \- user account information
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.br
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/etc/shadow \- encrypted passwords and age information
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.br
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$HOME/.profile \- initialization script for default shell
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.SH SEE ALSO
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.BR login (1),
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.BR sh (1),
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.BR suauth (5),
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.BR login.defs (5)
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.SH AUTHOR
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2007-10-07 17:14:14 +05:30
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Julianne Frances Haugh (jfh@austin.ibm.com)
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