71 lines
2.2 KiB
Groff
71 lines
2.2 KiB
Groff
.\"Generated by db2man.xsl. Don't modify this, modify the source.
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.de Sh \" Subsection
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.br
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.if t .Sp
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.ne 5
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.PP
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\fB\\$1\fR
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.PP
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..
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.de Sp \" Vertical space (when we can't use .PP)
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.if t .sp .5v
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.if n .sp
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..
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.de Ip \" List item
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.br
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.ie \\n(.$>=3 .ne \\$3
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.el .ne 3
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.IP "\\$1" \\$2
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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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.ad l
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.hy 0
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.HP 3
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\fBsu\fR [\-] [\fIusername\fR\ [\fIargs\fR]]
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.ad
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.hy
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.SH "DESCRIPTION"
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.PP
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\fBsu\fR is used to become another user during a login session\&. Invoked without a username, \fBsu\fR defaults to becoming the super user\&. The optional argument \fB\-\fR may be used to provide an environment similar to what the user would expect had the user logged in directly\&.
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.PP
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Additional arguments may be provided after the username, in which case they are supplied to the user´s login shell\&. In particular, an argument of \fB\-c\fR will cause the next argument to be treated as a command by most command interpreters\&. The command will be executed by the shell specified in \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\&. Invalid passwords will produce an error message\&. All attempts, both valid and invalid, are logged to detect 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 \fI$PATH\fR is reset to \fI/bin:/usr/bin\fR for normal users, or \fI/sbin:/bin:/usr/sbin:/usr/bin\fR for the super user\&. This may be changed with the \fIENV_PATH\fR and \fIENV_SUPATH\fR definitions in \fI/etc/login\&.defs\fR\&.
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.PP
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A subsystem login is indicated by the presence of a "*" as the first character of the login shell\&. The given home directory will be used as the root of a new file system which the user is actually logged into\&.
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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 may be in use at any particular site\&.
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.SH "FILES"
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.TP
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\fI/etc/passwd\fR
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user account information
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.TP
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\fI/etc/shadow\fR
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secure user account information
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.SH "SEE ALSO"
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.PP
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\fBlogin\fR(1), \fBsh\fR(1), \fBlogin\&.defs\fR(5), \fBsuauth\fR(5)
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.SH "AUTHOR"
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.PP
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Julianne Frances Haugh <jockgrrl@ix\&.netcom\&.com>
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