echo "Usage: setup.sh [USER]"
echo "Example: setup.sh alice"
echo

NewUser=$1
while [ ! "$NewUser" ]
do
  echo "=== To add a new user of name:"
  read -p ">>> " NewUser
done

useradd $NewUser
# usermod -a -G sudo $NewUser # Add to sudo group
passwd $NewUser
mkdir /home/$NewUser
chown $NewUser:$NewUser /home/$NewUser
chmod 700 /home/$NewUser

# Set default shell in /etc/passwd
# Debian 10 default to /bin/sh
sed -i "s|/home/$NewUser:/bin/sh$|/home/$NewUser:/bin/bash|g" /etc/passwd
# Debian 9 default to empty
sed -i "s|/home/$NewUser:$|/home/$NewUser:/bin/bash|g" /etc/passwd

echo "=== Allow the new user [$NewUser] to sudo without password? <y> for yes, <anything else> for no"
read -p ">>> " AllowSudo
if [ "$AllowSudo" == "y" ]
then
  #usermod -a -G sudo $NewUser # Add to sudo group # Option 1: add user to %sudo group
  echo "$NewUser ALL=(ALL:ALL) NOPASSWD:ALL" > /etc/sudoers.d/${NewUser//./-} # Option 2: add a user file into /etc/sudoers.d/
  chmod a-w /etc/sudoers.d/${NewUser//./-}
  echo "Added /etc/sudoers.d/${NewUser//./-} to allow sudo without password"
else
  echo "--- Nothing changed."
fi
echo