Useradd in Linux using script

vim adduser.sh

#!/bin/bash
# Script to add a user to Linux system

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

chmod 777 adduser.sh

[root@snk Desktop]# ./adduser.sh
Enter username : testuser
Enter password : **********
User has been added to system!