Add Linux user through script

Run the below script as root.

#!/bin/bash

if [ $(id -u) -eq 0 ]; then
   read -p "Enter username : " username
   read -s -p "Enter password : " password
   egrep "^$username" /etc/passwd >/dev/null
   if [ $? -eq 0 ]; then
       echo "$username exists!"
       exit 1
   else
       pass=$(perl -e 'print crypt($ARGV[0], "password")' $password)
       useradd -m -p $pass $username
       [ $? -eq 0 ] && echo "User has been added to system!" || echo "Failed to add a user!"
   fi
else
   echo "Only root may add a user to the system"
   exit 2
fi