User management commands of linux

sudo adduser usernameTo display value of a variable
sudo passwd -l 'username'Displays all environment variables
sudo userdel -r 'username'Create a new variable
sudo usermod -a -G GROUPNAME USERNAMERemove a variable
sudo deluser USER GROUPNAMETo set value of an environment variable
fingerGives information on all logged in user
finger usernameGives information of a particular user

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