Command to delete user password under Linux

Type the following command to delete a user password:
# passwd --delete username
# passwd -d username
Above command delete a user's password (make it empty). This is a quick way to disable a password for an account. It will set the named account passwordless. User will not able to login.
It is also a good idea to setup user shell to nologin to avoid security related problems:
# usrmod -s /sbin/nologin username
For example to delete password for user johnc, Type:
# passwd -d johnc
# usrmod -s /sbin/nologin johnc


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