An interesting thing about RHEL /etc/shadow file.
Its about the second field of /etc/shadow (if shadow passwords are enabled).
If the value is ! or *, the account is locked and the user is not allowed to log in.
If the value is !! a password has never been set before (and the user, not having set a password, will not be able to log in).
To disable an user, just replace the second field in his/her /etc/shadow entry with * or ! .
A few things, mostly technical notes...
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- Second field in /etc/shadow explained.
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