Linux: Delete user password command
In Linux system’s we could disable or delete passwords of an user account, this way we could disable user login. These option could achievable through many way. We would discuss this with delete user’s password from Linux system
So we would see how to user could not login once applying these changes.
Delete user password
We could delete user password or make it empty, this way user can’t login further on system locally or from remote machine. Below method could use to delete password from Linux system.
# password --delete u1
We have below one example for same.
# passwd --delete u1 Removing password for user u1. passwd: Success
We can also verify password has been deleted or not
# grep u1 /etc/shadow u1::17495:0:99999:7:::
In this case user can’t login on system locally or remotely. While login it will show below message on screen and on logs.
User try to login from remote # ssh email@example.com firstname.lastname@example.org's password: Permission denied, please try again. Below message displayed on /var/log/secure Nov 25 15:18:23 localhost sshd: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=192.168.122.1 user=u1 Nov 25 15:18:25 localhost sshd: Failed password for u1 from 192.168.122.1 port 41224 ssh2