#!/usr/bin/env bash

anotherUser() {
   read -p "Add another user? [y/n] yn"
   if [[ $yn = *[yY]* ]]; then
      checkUser
   fi
   exit
}
checkUser() {
while :
   do
      read -p "Enter user: " userName
      read -s -p "Enter password : " userPass
      if id "$userName" >/dev/null; then
         echo "User exists"
         anotherUser
      else
         echo adduser "$userName"
         printf "User %s has been addedn" "$userName"
         exit
      fi
   done
}
checkUser