adduser.sh

#!/usr/bin/env bash
# SECTION 1 | Set Host IPv4
# localhost: '127.0.0.1'                        # ADD USER TO LOCAL HOST
# remotehost <reopteIPv4>                       # ADD USER TO REMOTE HOST


# SECTION 2 | Generate Login Details
set -e                                          # STOP IF ANY ERROR
if [ $(id -u) -eq 0 ]; then                     # VERIFY ROOT THEN IF ROOT
    read -p "Enter username : " username        # ENTER USER NAME
    read -s -p "Enter password : " password     # ENTER PASSWORD
    # shellcheck disable=SC2196
    grep -E "^$username" /etc/passwd >/dev/null   # VERIFY USERNAME NOT IN etc/passw?
      if [ $? -eq 0 ]; then                       # IF NO
        echo "$username USER NAME UNAVAILABLE!" # OUTPUT USERNAME UNAVAILABLE
        exit 1                                  # BREAK
    else
      # sudo adduser --disabled-password --gecos "" ' "$username" '      ; # ADD USER DISABLED PASSWORD
      # sudo touch /home/'"$username"'/.ssh/authorized_keys            ; # CREATE SSH DIRECTORY
      # ' "echo $pubkey | sudo tee /home/$username/.ssh/authorized_keys; # APPEND PUBLIC KEY TO AUTHORIZED KEY FILE
      # sudo chown -R $username:$username /home/$username/.ssh
       # sudo chmod 700 /home/$username/.ssh                            ; # SET SSH FOLDER OWNERSHIP + PERMISSIONS
       # sudo chmod 600 /home/$username/.ssh/authorized_keys"           ; # SET AUTHORIZED KEY FOLDER OWNERSHIP + PERMISSIONS
    useradd -m -p "$username" "$password"
    usermod -a -G sudo "$username"
    [ $? -eq 0 ] && echo "$username"succesly added! || echo "FAILED TO ADD $username"
    fi
    echo "PERMISSIONS DENIED"
    exit 2
fi