Passwd: User not known to the underlying authentication -- to solve

Passwd: User not known to the underlying authentication -- to solve

During the exercise set by the instructor, the following error occurs: passwd: User not known to the underlying authentication. You can find out pwck after going online. pwconv can help me solve this problem. To remember this method, record it and share it with you.

First of all, I have manually added an account multiple times, and the information in/etc/passwd and/etc/shadow is messy, some information cannot be deleted manually, which leads to an error when I change the password. The following describes how to solve this problem.

Next, we should first familiarize ourselves with the commands in two linux systems: one is the pwck command and the other is the pwconv command:

Pwck verifies the integrity of system authentication information and checks whether the format of all entries in/etc/passwd and/etc/shadow is correct and whether the information of each field is valid. The system will prompt you to delete incorrectly formatted entries and other unrecoverable errors. pwconv will create/etc/shadow Based on/etc/passwd, in this way, the user's account information can be effectively managed. Then execute the command in sequence.

[Root @ taumy ~] #Sudo/usr/sbin/pwck

User adm: directory/var/adm does not exist

User news: the directory/etc/news does not exist.

User uucp: directory/var/spool/uucp does not exist

User gopher: directory/var/gopher does not exist

User ftp: directory/var/ftp does not exist

User pcap: directory/var/arpwatch does not exist

User avahi-autoipd: directory/var/lib/avahi-autoipd does not exist

User sabayon: directory/home/sabayon does not exist

Invalid password file item

Delete line ''? Yes

User mysql: directory/home/mysql does not exist

No matching password file entry in/etc/passwd

Delete line 'u1 :!! : 15970: 0: 99999: 7 :::'? Yes

Pwck: the file has been updated.

[Root @ taumy ~] # Sudo/usr/sbin/pwconv

[Root @ taumy ~] #Passwd nomas

Changing password for user nomas.

New UNIX password:

Bad password: it is too simplistic/systematic

Retype new UNIX password:

Passwd: all authentication tokens updated successfully

You can change the password in another way to get the desired result:

[Root @ taumy ~] #Echo "abc123" | passwd -- stdin nomas

Changing password for user nomas.

Passwd: all authentication tokens updated successfully.

This article from the "yunye" blog, please be sure to keep this source http://taumycheung.blog.51cto.com/7778179/1302941