Completely remove users under Linux

Lab environment: CENTOS7 virtual Machines
First create a normal user gubeiqing .

[[email protected] ~]# useradd gubeiqing[[email protected] ~]# passwd gubeiqingChanging password for user gubeiqing.New password:BAD PASSWORD: The password is a palindromeRetype new password:passwd: all authentication tokens updated successfully.

This succeeds in creating a normal user and then deleting the user.

[[email protected] ~]# userdel gubeiqing[[email protected] ~]#

The use of the useradd command was removed, but,,, the problem came when we created gubeiqing the user again:

[[email protected] ~]# useradd gubeiqinguseradd: warning: the home directory already exists.Not copying any file from skel directory into it.Creating mailbox file: File exists

The file already exists and cannot be created, why is this? Because the user is generated by default when the user is created, 家目录 密码文件 用户组 (without specifying the user group), and 邮箱文件 when the use userdel of the command is deleted only by deleting the user, and the user's files are still there, then the files need to be completely deleted. I took a look at about four places to deal with.

• Files in the /home directory
• /etc/passwdunder the user
• /etc/groupunder the user group
• The /var/spool/mail mailbox file under

Delete the files in turn.
1. Delete /home files from the directory

[[email protected] ~]# cd /home[[email protected] home]# lsgubeiqing[[email protected] home]# rm -rf gubeiqing[[email protected] home]# ls[[email protected] home]#

2. Delete users under /etc/passwd
We can take a look at this file.

 [[email protected] ~]# cat/etc/passwdroot:x:0:0:root:/root:/bin/bashbin:x:1:1:bin:/bin:/sbin/ nologindaemon:x:2:2:daemon:/sbin:/sbin/nologinadm:x:3:4:adm:/var/adm:/sbin/nologinlp:x:4:7:lp:/var/spool/lpd:/ sbin/nologinsync:x:5:0:sync:/sbin:/bin/syncshutdown:x:6:0:shutdown:/sbin:/sbin/shutdownhalt:x:7:0:halt:/sbin:/ Sbin/haltmail:x:8:12:mail:/var/spool/mail:/sbin/nologinoperator:x:11:0:operator:/root:/sbin/nologingames:x : 12:100:games:/usr/games:/sbin/nologinftp:x:14:50:ftp user:/var/ftp:/sbin/nologinnobody:x:99:99:nobody:/:/sbin/ NOLOGINSYSTEMD-NETWORK:X:192:192:SYSTEMD Network Management:/:/sbin/nologindbus:x:81:81:system Message Bus:/:/sbin /nologinpolkitd:x:999:997:user for Polkitd:/:/sbin/nologinpostfix:x:89:89::/var/spool/postfix:/sbin/nologinsshd: X:74:74:privilege-separated ssh:/var/empty/sshd:/sbin/nologinchrony:x:998:996::/var/lib/chrony:/sbin/ Nologindockerroot:x:997:994:docker user:/var/lib/docker:/sbin/nologingubeiqing:x:1000:1000::/home/gubeiqing:/ Bin/bash 

Here you can see all the users in this system, you can see the last line is the user just created, then use the vi editor to delete the last line of users.
3. Delete /etc/group the user group file under
Check this file first:

[[email protected] ~]# cat /etc/grouproot:x:0:bin:x:1:daemon:x:2:sys:x:3:adm:x:4:tty:x:5:disk:x:6:lp:x:7:mem:x:8:kmem:x:9:wheel:x:10:cdrom:x:11:mail:x:12:postfixman:x:15:dialout:x:18:floppy:x:19:games:x:20:tape:x:30:video:x:39:ftp:x:50:lock:x:54:audio:x:63:nobody:x:99:users:x:100:utmp:x:22:utempter:x:35:ssh_keys:x:999:input:x:998:systemd-journal:x:190:systemd-network:x:192:dbus:x:81:polkitd:x:997:postdrop:x:90:postfix:x:89:sshd:x:74:chrony:x:996:cgred:x:995:dockerroot:x:994:gubeiqing:x:1000:

Then use vi the editor to delete the user group.
4. Delete /var/spool/mail the mailbox file under

[[email protected] ~]# cd /var/spool/mail[[email protected] mail]# lsgubeiqing[[email protected] mail]# rm -rf gubeiqing[[email protected] mail]# ls[[email protected] mail]#

Delete is complete before you create the gubeiqing user.

[[email protected] mail]# useradd gubeiqing[[email protected] mail]# passwd gubeiqingChanging password for user gubeiqing.New password:BAD PASSWORD: The password is a palindromeRetype new password:passwd: all authentication tokens updated successfully.

Get!

In addition to this method there is a way to completely delete.

[[email protected] mail]# userdel -rf gubeiqing[[email protected] mail]# useradd gubeiqing[[email protected] mail]# passwd gubeiqingChanging password for user gubeiqing.New password:BAD PASSWORD: The password is a palindromeRetype new password:passwd: all authentication tokens updated successfully.

Using both methods, users can be completely removed.

Completely remove users under Linux