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+'\" t
+.\"     Title: su
+.\"    Author: Julianne Frances Haugh
+.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
+.\"      Date: 2020-01-23
+.\"    Manual: 用户命令
+.\"    Source: shadow-utils 4.8.1
+.\"  Language: Chinese Simplified
+.\"
+.TH "SU" "1" "2020-01-23" "shadow\-utils 4\&.8\&.1" "用户命令"
+.\" -----------------------------------------------------------------
+.\" * Define some portability stuff
+.\" -----------------------------------------------------------------
+.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+.\" http://bugs.debian.org/507673
+.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
+.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+.ie \n(.g .ds Aq \(aq
+.el       .ds Aq '
+.\" -----------------------------------------------------------------
+.\" * set default formatting
+.\" -----------------------------------------------------------------
+.\" disable hyphenation
+.nh
+.\" disable justification (adjust text to left margin only)
+.ad l
+.\" -----------------------------------------------------------------
+.\" * MAIN CONTENT STARTS HERE *
+.\" -----------------------------------------------------------------
+.SH "名称"
+su \- 更改用户 ID 或成为超级用户
+.SH "大纲"
+.HP \w'\fBsu\fR\ 'u
+\fBsu\fR [\fI选项\fR] [\fI\-\fR] [\fI用户名\fR\ [\ \fIargs\fR\ ]]
+.SH "描述"
+.PP
+The
+\fBsu\fR
+command is used to become another user during a login session\&. Invoked without a
+\fBusername\fR,
+\fBsu\fR
+defaults to becoming the superuser\&. The
+\fB\-\fR
+option may be used to provide an environment similar to what the user would expect had the user logged in directly\&. The
+\fB\-c\fR
+option may be used to treat the next argument as a command by most shells\&.
+.PP
+Options are recognized everywhere in the argument list\&. You can use the
+\fB\-\-\fR
+argument to stop option parsing\&. The
+\fB\-\fR
+option is special: it is also recognized after
+\fB\-\-\fR, but has to be placed before
+\fBusername\fR\&.
+.PP
+如果合适，将提示用户输入一个密码。输入无效的密码会产生一个错误消息。所有的尝试，无论成功还是失败，都会被记录，以检测对系统的滥用。
+.PP
+The current environment is passed to the new shell\&. The value of
+\fB$PATH\fR
+is reset to
+/bin:/usr/bin
+for normal users, or
+/sbin:/bin:/usr/sbin:/usr/bin
+for the superuser\&. This may be changed with the
+\fBENV_PATH\fR
+and
+\fBENV_SUPATH\fR
+definitions in
+/etc/login\&.defs\&.
+.PP
+在登录 shell 中以第一个字符是\(lq*\(rq标注的是子系统登录。给定的主目录将被用于用户实际登录的新文件系统的根。
+.SH "选项"
+.PP
+The options which apply to the
+\fBsu\fR
+command are:
+.PP
+\fB\-c\fR, \fB\-\-command\fR\ \&\fICOMMAND\fR
+.RS 4
+Specify a command that will be invoked by the shell using its
+\fB\-c\fR\&.
+.sp
+The executed command will have no controlling terminal\&. This option cannot be used to execute interactive programs which need a controlling TTY\&.
+.RE
+.PP
+\fB\-\fR, \fB\-l\fR, \fB\-\-login\fR
+.RS 4
+提供一个类似于用户直接登录的环境，用户可能会希望这样。
+.sp
+When
+\fB\-\fR
+is used, it must be specified before any
+\fBusername\fR\&. For portability it is recommended to use it as last option, before any
+\fBusername\fR\&. The other forms (\fB\-l\fR
+and
+\fB\-\-login\fR) do not have this restriction\&.
+.RE
+.PP
+\fB\-s\fR, \fB\-\-shell\fR\ \&\fISHELL\fR
+.RS 4
+将使用的 shell。
+.sp
+The invoked shell is chosen from (highest priority first):
+.PP
+.RS 4
+The shell specified with \-\-shell\&.
+.RE
+.PP
+.RS 4
+If
+\fB\-\-preserve\-environment\fR
+is used, the shell specified by the
+\fB$SHELL\fR
+environment variable\&.
+.RE
+.PP
+.RS 4
+The shell indicated in the
+/etc/passwd
+entry for the target user\&.
+.RE
+.PP
+.RS 4
+/bin/sh
+if a shell could not be found by any above method\&.
+.RE
+.sp
+If the target user has a restricted shell (i\&.e\&. the shell field of this user\*(Aqs entry in
+/etc/passwd
+is not listed in
+/etc/shells), then the
+\fB\-\-shell\fR
+option or the
+\fB$SHELL\fR
+environment variable won\*(Aqt be taken into account, unless
+\fBsu\fR
+is called by root\&.
+.RE
+.PP
+\fB\-m\fR, \fB\-p\fR, \fB\-\-preserve\-environment\fR
+.RS 4
+Preserve the current environment, except for:
+.PP
+\fB$PATH\fR
+.RS 4
+reset according to the
+/etc/login\&.defs
+options
+\fBENV_PATH\fR
+or
+\fBENV_SUPATH\fR
+(see below);
+.RE
+.PP
+\fB$IFS\fR
+.RS 4
+reset to
+\(lq<space><tab><newline>\(rq, if it was set\&.
+.RE
+.sp
+If the target user has a restricted shell, this option has no effect (unless
+\fBsu\fR
+is called by root)\&.
+.sp
+Note that the default behavior for the environment is the following:
+.PP
+.RS 4
+The
+\fB$HOME\fR,
+\fB$SHELL\fR,
+\fB$USER\fR,
+\fB$LOGNAME\fR,
+\fB$PATH\fR, and
+\fB$IFS\fR
+environment variables are reset\&.
+.RE
+.PP
+.RS 4
+If
+\fB\-\-login\fR
+is not used, the environment is copied, except for the variables above\&.
+.RE
+.PP
+.RS 4
+If
+\fB\-\-login\fR
+is used, the
+\fB$TERM\fR,
+\fB$COLORTERM\fR,
+\fB$DISPLAY\fR, and
+\fB$XAUTHORITY\fR
+environment variables are copied if they were set\&.
+.RE
+.PP
+.RS 4
+If
+\fB\-\-login\fR
+is used, the
+\fB$TZ\fR,
+\fB$HZ\fR, and
+\fB$MAIL\fR
+environment variables are set according to the
+/etc/login\&.defs
+options
+\fBENV_TZ\fR,
+\fBENV_HZ\fR,
+\fBMAIL_DIR\fR, and
+\fBMAIL_FILE\fR
+(see below)\&.
+.RE
+.PP
+.RS 4
+If
+\fB\-\-login\fR
+is used, other environment variables might be set by the
+\fBENVIRON_FILE\fR
+file (see below)\&.
+.RE
+.sp
+.RE
+.SH "CAVEATS"
+.PP
+This version of
+\fBsu\fR
+has many compilation options, only some of which may be in use at any particular site\&.
+.SH "配置文件"
+.PP
+The following configuration variables in
+/etc/login\&.defs
+change the behavior of this tool:
+.PP
+\fBCONSOLE\fR (string)
+.RS 4
+如果定义了，或者是包含设备名(没行一个)的文件的完整路径名，或者是\(lq:\(rq分隔的设备名列表。将只会在这写设备上允许 root 登录。
+.sp
+如果没有定义，可以在任何设备上使用 root。
+.sp
+指定的设备时不带 /dev/ 前缀。
+.RE
+.PP
+\fBCONSOLE_GROUPS\fR (string)
+.RS 4
+List of groups to add to the user\*(Aqs supplementary groups set when logging in on the console (as determined by the CONSOLE setting)\&. Default is none\&.
+
+Use with caution \- it is possible for users to gain permanent access to these groups, even when not logged in on the console\&.
+.RE
+.PP
+\fBDEFAULT_HOME\fR (boolean)
+.RS 4
+如果不能 cd 到主目录时，说明是否允许登录。默认是否。
+.sp
+If set to
+\fIyes\fR, the user will login in the root (/) directory if it is not possible to cd to her home directory\&.
+.RE
+.PP
+\fBENV_HZ\fR (string)
+.RS 4
+If set, it will be used to define the HZ environment variable when a user login\&. The value must be preceded by
+\fIHZ=\fR\&. A common value on Linux is
+\fIHZ=100\fR\&.
+.RE
+.PP
+\fBENVIRON_FILE\fR (string)
+.RS 4
+如果此文件存在，并且可读，将会从中读取登录环境。所有行都必须是 name=value 的格式。
+.sp
+以 # 开头的行将视为注释，并被忽略。
+.RE
+.PP
+\fBENV_PATH\fR (string)
+.RS 4
+If set, it will be used to define the PATH environment variable when a regular user login\&. The value is a colon separated list of paths (for example
+\fI/bin:/usr/bin\fR) and can be preceded by
+\fIPATH=\fR\&. The default value is
+\fIPATH=/bin:/usr/bin\fR\&.
+.RE
+.PP
+\fBENV_SUPATH\fR (string)
+.RS 4
+If set, it will be used to define the PATH environment variable when the superuser login\&. The value is a colon separated list of paths (for example
+\fI/sbin:/bin:/usr/sbin:/usr/bin\fR) and can be preceded by
+\fIPATH=\fR\&. The default value is
+\fIPATH=/sbin:/bin:/usr/sbin:/usr/bin\fR\&.
+.RE
+.PP
+\fBENV_TZ\fR (string)
+.RS 4
+If set, it will be used to define the TZ environment variable when a user login\&. The value can be the name of a timezone preceded by
+\fITZ=\fR
+(for example
+\fITZ=CST6CDT\fR), or the full path to the file containing the timezone specification (for example
+/etc/tzname)\&.
+.sp
+If a full path is specified but the file does not exist or cannot be read, the default is to use
+\fITZ=CST6CDT\fR\&.
+.RE
+.PP
+\fBLOGIN_STRING\fR (string)
+.RS 4
+此字符串用于提示输入密码。默认是 "Password: "，或者翻译了的结果(汉语中翻译为了\(lq密码：\(rq)。如果设置了此变量，提示不会被翻译。
+.sp
+If the string contains
+\fI%s\fR, this will be replaced by the user\*(Aqs name\&.
+.RE
+.PP
+\fBMAIL_CHECK_ENAB\fR (boolean)
+.RS 4
+启用登录时检查和现实邮箱状态。
+.sp
+如果 shell 的启动文件已经检查了邮件("mailx \-e" 或者其它同功能的工具)，您应该禁用它。
+.RE
+.PP
+\fBMAIL_DIR\fR (string)
+.RS 4
+邮箱目录。修改或删除用户账户时需要处理邮箱，如果没有指定，将使用编译时指定的默认值。
+.RE
+.PP
+\fBMAIL_FILE\fR (string)
+.RS 4
+定义用户邮箱文件的位置(相对于主目录)。
+.RE
+.PP
+The
+\fBMAIL_DIR\fR
+and
+\fBMAIL_FILE\fR
+variables are used by
+\fBuseradd\fR,
+\fBusermod\fR, and
+\fBuserdel\fR
+to create, move, or delete the user\*(Aqs mail spool\&.
+.PP
+If
+\fBMAIL_CHECK_ENAB\fR
+is set to
+\fIyes\fR, they are also used to define the
+\fBMAIL\fR
+environment variable\&.
+.PP
+\fBQUOTAS_ENAB\fR (boolean)
+.RS 4
+Enable setting of resource limits from
+/etc/limits
+and ulimit, umask, and niceness from the user\*(Aqs passwd gecos field\&.
+.RE
+.PP
+\fBSULOG_FILE\fR (string)
+.RS 4
+如果定义了，所有的 su 活动都会记录到此文件。
+.RE
+.PP
+\fBSU_NAME\fR (string)
+.RS 4
+如果定义了，就是运行\(lqsu \-\(rq时显示的命令名称。例如，如果定义为\(lqsu\(rq，那么\(lqps\(rq会显示此命令为\(lq\-su\(rq。如果没有定义，\(lqps\(rq将会显示实际执行的 shell，例如类似于\(lq\-sh\(rq。
+.RE
+.PP
+\fBSU_WHEEL_ONLY\fR (boolean)
+.RS 4
+If
+\fIyes\fR, the user must be listed as a member of the first gid 0 group in
+/etc/group
+(called
+\fIroot\fR
+on most Linux systems) to be able to
+\fBsu\fR
+to uid 0 accounts\&. If the group doesn\*(Aqt exist or is empty, no one will be able to
+\fBsu\fR
+to uid 0\&.
+.RE
+.PP
+\fBSYSLOG_SU_ENAB\fR (boolean)
+.RS 4
+Enable "syslog" logging of
+\fBsu\fR
+activity \- in addition to sulog file logging\&.
+.RE
+.PP
+\fBUSERGROUPS_ENAB\fR (boolean)
+.RS 4
+如果 uid 和 gid 相同，用户名和主用户名也相同，使非 root 组的组掩码位和属主位相同 (如：022 \-> 002, 077 \-> 007)。
+.sp
+If set to
+\fIyes\fR,
+\fBuserdel\fR
+will remove the user\*(Aqs group if it contains no more members, and
+\fBuseradd\fR
+will create by default a group with the name of the user\&.
+.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
+.PP
+/etc/login\&.defs
+.RS 4
+Shadow 密码套件配置。
+.RE
+.SH "退出值"
+.PP
+On success,
+\fBsu\fR
+returns the exit value of the command it executed\&.
+.PP
+If this command was terminated by a signal,
+\fBsu\fR
+returns the number of this signal plus 128\&.
+.PP
+If su has to kill the command (because it was asked to terminate, and the command did not terminate in time),
+\fBsu\fR
+returns 255\&.
+.PP
+Some exit values from
+\fBsu\fR
+are independent from the executed command:
+.PP
+\fI0\fR
+.RS 4
+success (\fB\-\-help\fR
+only)
+.RE
+.PP
+\fI1\fR
+.RS 4
+System or authentication failure
+.RE
+.PP
+\fI126\fR
+.RS 4
+The requested command was not found
+.RE
+.PP
+\fI127\fR
+.RS 4
+The requested command could not be executed
+.RE
+.SH "参见"
+.PP
+\fBlogin\fR(1),
+\fBlogin.defs\fR(5),
+\fBsg\fR(1),
+\fBsh\fR(1)\&.