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Here is some useful command for managing user accounts in Linux environment

Replace testuser with your username :

sudo useradd testuser

Set a password for new user :

sudo passwd testuser

Add the new user to a group e.g sudo group :

sudo usermod -a -G sudo testuser

Seeing group membership for your user :

sudo groups testuser

Seeing a group members e.g sudo group :

cat /etc/group | grep sudo

Remove your user from a group e.g sudo group:

sudo deluser testuser sudo

Disallow user from logging in :

sudo usermod --expiredate 1 testuser

Opposite of above for re-enabling a user and set the expiration date to never :

sudo usermod --expiredate "" testuser

For lock a user account , This prepends a ! to the password hash so that no password will match it anymore.

sudo passwd -l testuser 

To unlock it :

sudo passwd -u testuser