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Linux pwconv...

原创 Linux操作系统 作者:ginni_hua 时间:2009-07-06 15:27:21 0 删除 编辑

變更密碼ERROR:

passwd: User not known to the underlying authentication module"

無法變更成功.

只需執行命令pwconv,把系統用戶密碼從passwd/group中轉換到shadow/gshadow中,再進行密碼變更即OK.

//

NAME
       pwconv, pwunconv, grpconv, grpunconv - convert to and from shadow passwords and groups.

SYNOPSIS
       pwconv
       pwunconv
       grpconv
       grpunconv

DESCRIPTION
       These  four  programs  all operate on the normal and shadow password and group files: /etc/passwd, /etc/group,
       /etc/shadow, and /etc/gshadow.

       pwconv creates shadow from passwd and an optionally existing shadow.  pwunconv creates passwd from passwd  and
       shadow  and  then  removes  shadow.   grpconv  creates  gshadow from group and an optionally existing gshadow.
       grpunconv creates group from group and gshadow and then removes gshadow.

       Each program acquires the necessary locks before conversion.

       pwconv and grpconv are similiar.  First, entries in the shadowed file which dont exist in the main  file
 are
       removed.  Then, shadowed entries which dont have x as the password in the main file are u
pdated.  Any miss-
       ing shadowed entries are added.  Finally, passwords in the main file are replaced with  x.   Thes
e  programs
       can be used for initial conversion as well to update the shadowed file if the main file is edited by hand.

       pwconv will use the values of PASS_MIN_DAYS, PASS_MAX_DAYS, and PASS_WARN_AGE from /etc/login.defs when adding
       new entries to /etc/shadow.

       Likewise, pwunconv and grpunconv are similiar.  Passwords in the main file are updated from the shadowed file.
       Entries  which exist in the main file but not in the shadowed file are left alone.  Finally, the shadowed file
       is removed.

       Some password aging information is lost by pwunconv.  It will convert what it can.

BUGS
       Errors in the password or group files (such as invalid or duplicate entries) may cause these programs to  loop
       forever or fail in other strange ways.  Please run pwck and grpck to correct any such errors before converting
       to or from shadow passwords or groups.

SEE ALSO
       login.defs(5), grpck(8), pwck(8)

 

来自 “ ITPUB博客 ” ,链接:http://blog.itpub.net/7836221/viewspace-608429/,如需转载,请注明出处,否则将追究法律责任。

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