134 lines
4.0 KiB
Groff
134 lines
4.0 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 "LOGIN" 1 "" "" ""
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.SH NAME
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login \- begin session on the system
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.SH "SYNOPSIS"
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.ad l
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.hy 0
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.HP 6
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\fBlogin\fR [\-p] [\fIusername\fR] [\fIENV=VAR\fR...]
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.ad
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.hy
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.ad l
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.hy 0
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.HP 6
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\fBlogin\fR [\-p] [\-h\ \fIhost\fR] [\-f\ \fIusername\fR]
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.ad
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.hy
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.ad l
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.hy 0
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.HP 6
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\fBlogin\fR [\-p] \-r\ \fIhost\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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\fBlogin\fR is used to establish a new session with the system\&. It is normally invoked automatically by responding to the \fIlogin:\fR prompt on the user´s terminal\&. \fBlogin\fR may be special to the shell and may not be invoked as a sub\-process\&. Typically, \fBlogin\fR is treated by the shell as \fIexec login\fR which causes the user to exit from the current shell\&. Attempting to execute \fBlogin\fR from any shell but the login shell will produce an error message\&.
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.PP
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The user is then prompted for a password, where appropriate\&. Echoing is disabled to prevent revealing the password\&. Only a small number of password failures are permitted before \fBlogin\fR exits and the communications link is severed\&.
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.PP
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If password aging has been enabled for your account, you may be prompted for a new password before proceeding\&. You will be forced to provide your old password and the new password before continuing\&. Please refer to \fBpasswd\fR(1) for more information\&.
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.PP
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After a successful login, you will be informed of any system messages and the presence of mail\&. You may turn off the printing of the system message file, \fI/etc/motd\fR, by creating a zero\-length file \&.hushlogin in your login directory\&. The mail message will be one of "\fIYou have new mail\&.\fR ", "\fIYou have mail\&.\fR", or "\fINo Mail\&.\fR "according to the condition of your mailbox\&.
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.PP
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Your user and group ID will be set according to their values in the \fI/etc/passwd\fR file\&. The value for \fI$HOME\fR, \fI$SHELL\fR, \fI$PATH\fR, \fI$LOGNAME\fR, and \fI$MAIL\fR are set according to the appropriate fields in the password entry\&. Ulimit, umask and nice values may also be set according to entries in the GECOS field\&.
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.PP
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On some installations, the environmental variable \fI$TERM\fR will be initialized to the terminal type on your tty line, as specified in \fI/etc/ttytype\fR\&.
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.PP
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An initialization script for your command interpreter may also be executed\&. Please see the appropriate manual section for more information on this function\&.
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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 "OPTIONS"
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.TP
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\fB\-f\fR
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Do not perform authentication, user is preauthenticated\&.
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.TP
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\fB\-h\fR
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Name of the remote host for this login\&.
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.TP
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\fB\-p\fR
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Preserve environment\&.
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.TP
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\fB\-r\fR
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Perform autologin protocol for rlogin\&.
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.PP
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The \fB\-r\fR, \fB\-h\fR and \fB\-f\fR options are only used when \fBlogin\fR is invoked by root\&.
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.SH "CAVEATS"
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.PP
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This version of \fBlogin\fR has many compilation options, only some of which may be in use at any particular site\&.
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.PP
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The location of files is subject to differences in system configuration\&.
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.SH "FILES"
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.TP
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\fI/var/run/utmp\fR
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list of current login sessions
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.TP
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\fI/var/log/wtmp\fR
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list of previous login sessions
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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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.TP
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\fI/etc/motd\fR
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system message of the day file
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.TP
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\fI/etc/nologin\fR
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prevent non\-root users from logging in
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.TP
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\fI/etc/ttytype\fR
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list of terminal types
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.TP
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\fI$HOME/\&.hushlogin\fR
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suppress printing of system messages
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.SH "SEE ALSO"
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.PP
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\fBmail\fR(1), \fBpasswd\fR(1), \fBsh\fR(1), \fBsu\fR(1), \fBlogin\&.defs\fR(5), \fBnologin\fR(5), \fBpasswd\fR(5), \fBgetty\fR(8)
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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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