'\" t
.\"     Title: sulogin
.\"    Author: Julianne Frances Haugh
.\" Generator: DocBook XSL Stylesheets v1.76.1 <http://docbook.sf.net/>
.\"      Date: 2012-05-25
.\"    Manual: 系统管理命令
.\"    Source: shadow-utils 4.1.5.1
.\"  Language: Chinese Simplified
.\"
.TH "SULOGIN" "8" "2012-05-25" "shadow\-utils 4\&.1\&.5\&.1" "系统管理命令"
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.SH "名称"
sulogin \- Single\-user login
.SH "SYNTAX"
.PP
\fBsulogin\fR
[\fItty\-device\fR]
.SH "描述"
.PP
The
\fBsulogin\fR
command is invoked by
\fBinit\fR
prior to allowing the user access to the system when in single user mode\&. This feature may only be available on certain systems where
\fBinit\fR
has been modified accordingly, or where the
/etc/inittab
has an entry for a single user login\&.
.PP
The user is prompted
.PP
Type control\-d to proceed with normal startup, (or give root password for system maintenance):
.PP
Input and output will be performed with the standard file descriptors unless the optional device name argument is provided\&.
.PP
If the user enters the correct root password, a login session is initiated\&. When
\fIEOF\fR
is pressed instead, the system enters multi\-user mode\&.
.PP
After the user exits the single\-user shell, or presses
\fIEOF\fR, the system begins the initialization process required to enter multi\-user mode\&.
.SH "CAVEATS"
.PP
This command can only be used if
\fBinit\fR
has been modified to call
\fBsulogin\fR
instead of
/bin/sh, or if the user has set the
\fIinittab\fR
to support a single user login\&. For example, the line:
.PP
co:s:respawn:/etc/sulogin /dev/console
.PP
should execute the sulogin command in single user mode\&.
.PP
As complete an environment as possible is created\&. However, various devices may be unmounted or uninitialized and many of the user commands may be unavailable or nonfunctional as a result\&.
.SH "配置文件"
.PP
在
/etc/login\&.defs
中有如下配置变量，可以用来更改此工具的行为：
.PP
\fBENV_HZ\fR (string)
.RS 4
如果设置了，将会用于在用户登录时定义 HZ 环境变量。值必须以
\fIHZ=\fR
开头。Linux 上的常用值是
\fIHZ=100\fR。
.RE
.PP
\fBENV_TZ\fR (string)
.RS 4
如果设置了，它将用于在用户登录时定义 TZ 环境变量。此值可以是以
\fITZ=\fR
开头的时区名(例如
\fITZ=CST6CDT\fR)，或者是包含时区规则的文件完整路径(例如
/etc/tzname)。
.sp
如果将完整路径指定为了一个不存在或不可读的文件，则默认使用
\fITZ=CST6CDT\fR。
.RE
.SH "文件"
.PP
/etc/passwd
.RS 4
用户账户信息。
.RE
.PP
/etc/shadow
.RS 4
安全用户账户信息。
.RE
.SH "参见"
.PP

\fBlogin\fR(1),
\fBsh\fR(1),
\fBinit\fR(8)\&.