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+'\" t
+.\" Title: passwd
+.\" Author: Julianne Frances Haugh
+.\" Generator: DocBook XSL Stylesheets vsnapshot <http://docbook.sf.net/>
+.\" Date: 2022-11-08
+.\" Manual: 用户命令
+.\" Source: shadow-utils 4.13
+.\" Language: Chinese Simplified
+.\"
+.TH "PASSWD" "1" "2022-11-08" "shadow\-utils 4\&.13" "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"
+passwd \- 更改用户密码
+.SH "大纲"
+.HP \w'\fBpasswd\fR\ 'u
+\fBpasswd\fR [\fI选项\fR] [\fI登录\fR]
+.SH "描述"
+.PP
+The
+\fBpasswd\fR
+command changes passwords for user accounts\&. A normal user may only change the password for their own account, while the superuser may change the password for any account\&.
+\fBpasswd\fR
+also changes the account or associated password validity period\&.
+.SS "密码更改"
+.PP
+如果有旧密码,首先提示用户输入旧密码。加密这个密码然后和存储的密码进行比较。用户只有一次机会输入正确密码。允许超级用户略过这个步骤,以便更改忘记了的密码。
+.PP
+After the password has been entered, password aging information is checked to see if the user is permitted to change the password at this time\&. If not,
+\fBpasswd\fR
+refuses to change the password and exits\&.
+.PP
+提示用户输入两次新密码。第二次和第一次进行比较,并且需要相同才能更改密码。
+.PP
+然后,测试密码的负责程度。一般来讲,密码应该包含 6 到 8 位字符,从下边的一个或多个集合中选择:
+.sp
+.RS 4
+.ie n \{\
+\h'-04'\(bu\h'+03'\c
+.\}
+.el \{\
+.sp -1
+.IP \(bu 2.3
+.\}
+小写字母
+.RE
+.sp
+.RS 4
+.ie n \{\
+\h'-04'\(bu\h'+03'\c
+.\}
+.el \{\
+.sp -1
+.IP \(bu 2.3
+.\}
+数字 0 到 9
+.RE
+.sp
+.RS 4
+.ie n \{\
+\h'-04'\(bu\h'+03'\c
+.\}
+.el \{\
+.sp -1
+.IP \(bu 2.3
+.\}
+标点符号
+.RE
+.PP
+Care must be taken not to include the system default erase or kill characters\&.
+\fBpasswd\fR
+will reject any password which is not suitably complex\&.
+.SS "关于用户密码的提示"
+.PP
+The security of a password depends upon the strength of the encryption algorithm and the size of the key space\&. The legacy
+\fIUNIX\fR
+System encryption method is based on the NBS DES algorithm\&. More recent methods are now recommended (see
+\fBENCRYPT_METHOD\fR)\&. The size of the key space depends upon the randomness of the password which is selected\&.
+.PP
+由于粗心地或处理选择密码,会危及密码的安全。由于这个原因,您不应该选择出现在词典中或者必须要写下来才能记住的密码。密码也不应该是一个名字、许可证号、生日或者街道号。所有这些可以用于猜测来损害系统安全。
+.PP
+You can find advice on how to choose a strong password on http://en\&.wikipedia\&.org/wiki/Password_strength
+.SH "选项"
+.PP
+The options which apply to the
+\fBpasswd\fR
+command are:
+.PP
+\fB\-a\fR, \fB\-\-all\fR
+.RS 4
+This option can be used only with
+\fB\-S\fR
+and causes show status for all users\&.
+.RE
+.PP
+\fB\-d\fR, \fB\-\-delete\fR
+.RS 4
+删除用户密码(让它为空)。这是禁用一个用户密码的快速方法。它将设置给出名称的账户。
+.RE
+.PP
+\fB\-e\fR, \fB\-\-expire\fR
+.RS 4
+让一个账户的密码立即过期。这可以强制一个用户下次登录时更改密码。
+.RE
+.PP
+\fB\-h\fR, \fB\-\-help\fR
+.RS 4
+显示帮助信息并退出。
+.RE
+.PP
+\fB\-i\fR, \fB\-\-inactive\fR\ \&\fIINACTIVE\fR
+.RS 4
+This option is used to disable an account after the password has been expired for a number of days\&. After a user account has had an expired password for
+\fIINACTIVE\fR
+days, the user may no longer sign on to the account\&.
+.RE
+.PP
+\fB\-k\fR, \fB\-\-keep\-tokens\fR
+.RS 4
+表示密码更改只应该因为认证口令(密码)过期更改。用户希望保持他们尚未过期的口令。
+.RE
+.PP
+\fB\-l\fR, \fB\-\-lock\fR
+.RS 4
+锁定指定账户的密码。此选项通过将密码更改为一个不可能与加密值匹配的值来禁用(它在密码开头添加一个\(lq!\(rq)。
+.sp
+Note that this does not disable the account\&. The user may still be able to login using another authentication token (e\&.g\&. an SSH key)\&. To disable the account, administrators should use
+\fBusermod \-\-expiredate 1\fR
+(this set the account\*(Aqs expire date to Jan 2, 1970)\&.
+.sp
+被锁定了密码的用户不允许更改密码。
+.RE
+.PP
+\fB\-n\fR, \fB\-\-mindays\fR\ \&\fIMIN_DAYS\fR
+.RS 4
+Set the minimum number of days between password changes to
+\fIMIN_DAYS\fR\&. A value of zero for this field indicates that the user may change their password at any time\&.
+.RE
+.PP
+\fB\-q\fR, \fB\-\-quiet\fR
+.RS 4
+安静模式。
+.RE
+.PP
+\fB\-r\fR, \fB\-\-repository\fR\ \&\fIREPOSITORY\fR
+.RS 4
+change password in
+\fIREPOSITORY\fR
+repository
+.RE
+.PP
+\fB\-R\fR, \fB\-\-root\fR\ \&\fICHROOT_DIR\fR
+.RS 4
+Apply changes in the
+\fICHROOT_DIR\fR
+directory and use the configuration files from the
+\fICHROOT_DIR\fR
+directory\&. Only absolute paths are supported\&.
+.RE
+.PP
+\fB\-S\fR, \fB\-\-status\fR
+.RS 4
+显示账户状态信息。状态信息包含 7 个字段。首个字段是用户的登录名,第二个字段表示用户账户是否已经锁定密码(L)、没有密码 (NP)或者密码可用(P),第三个字段给出最后一次更改密码的日期。接下来的四个字段分别是密码的最小年龄、最大年龄、警告期和禁用期。这些年龄以天为单位计算。
+.RE
+.PP
+\fB\-u\fR, \fB\-\-unlock\fR
+.RS 4
+Unlock the password of the named account\&. This option re\-enables a password by changing the password back to its previous value (to the value before using the
+\fB\-l\fR
+option)\&.
+.RE
+.PP
+\fB\-w\fR, \fB\-\-warndays\fR\ \&\fIWARN_DAYS\fR
+.RS 4
+Set the number of days of warning before a password change is required\&. The
+\fIWARN_DAYS\fR
+option is the number of days prior to the password expiring that a user will be warned that their password is about to expire\&.
+.RE
+.PP
+\fB\-x\fR, \fB\-\-maxdays\fR\ \&\fIMAX_DAYS\fR
+.RS 4
+Set the maximum number of days a password remains valid\&. After
+\fIMAX_DAYS\fR, the password is required to be changed\&.
+.sp
+Passing the number
+\fI\-1\fR
+as
+\fIMAX_DAYS\fR
+will remove checking a password\*(Aqs validity\&.
+.RE
+.SH "CAVEATS"
+.PP
+密码复杂性检查在每台机器间不同。用户应该选择适合的尽量复杂的密码。
+.PP
+在启动了 NIS 的系统上,如果没有登录 NIS 服务器,用户或许不能更改自己的密码。
+.SH "配置文件"
+.PP
+The following configuration variables in
+/etc/login\&.defs
+change the behavior of this tool:
+.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
+The
+\fBpasswd\fR
+command exits with the following values:
+.PP
+\fI0\fR
+.RS 4
+success
+.RE
+.PP
+\fI1\fR
+.RS 4
+permission denied
+.RE
+.PP
+\fI2\fR
+.RS 4
+invalid combination of options
+.RE
+.PP
+\fI3\fR
+.RS 4
+unexpected failure, nothing done
+.RE
+.PP
+\fI4\fR
+.RS 4
+unexpected failure,
+passwd
+file missing
+.RE
+.PP
+\fI5\fR
+.RS 4
+passwd
+file busy, try again
+.RE
+.PP
+\fI6\fR
+.RS 4
+invalid argument to option
+.RE
+.SH "参见"
+.PP
+\fBchpasswd\fR(8),
+\fBpasswd\fR(5),
+\fBshadow\fR(5),
+\fBlogin.defs\fR(5),
+\fBusermod\fR(8)\&.