User

List User

List all local user

cut -d: -f1 /etc/passwd

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Add User

Add new user

sudo adduser USERNAME

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Modify User

Change username

usermod -l new_username old_username

Change user wassword

sudo passwd USERNAME
OR
echo "PASSWORD" | sudo passwd --stdin USERNAME

Change user shell

sudo chsh USERNAME

Change user details, e.g. the real name

sudo chfn USERNAME

Add user to group

sudo adduser USERNAME GROUPNAME
OR
sudo usermod -aG sudo USERNAME