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Unable to change user password on AWS using `passwd` command

I am using Amazon's AWS insances running CentOS. I was trying to create a user with SUDO privilege and then disable the Root login to secure the systems. I have already done the required to bring this ...
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What is the affect of executing “sudo passwd” on a system without a root account?

I've just used "sudo passwd" instead of "passwd" on a system by mistake and I'm wondering what the affect of this would be. There are two users on the system, my user account which has sudo privileges ...