Adding user with password Linux

AddingUserWithPassword_Linux.sh

#!/bin/bash
# Purpose - Script to add a user to Linux system including passsword
# Original Author - Vivek Gite <www.cyberciti.biz> under GPL v2.0+
# Updated by - Alejandro Leal @bluPhy
# ------------------------------------------------------------------
# Am i Root user?
if [ $(id -u) -eq 0 ]; then
	read -p "Enter username : " username
	while true; do
		read -p "Provide the password for default username (kali):" -s -r password
		if [[ $password =~ ^(?=.*[0-9])(?=.*[A-Z])(?=.*[a-z]).{8,}$ ]]; then
			# Password meets all conditions
			break
		else
			echo "Error: Password must be at least 8 characters long and contain at least one digit, one uppercase letter, and one lowercase letter."
		fi
	done
	grep -E "^$username" /etc/passwd >/dev/null
	if [ $? -eq 0 ]; then
		echo "$username exists!"
		exit 1
	else
		password_salt=$(openssl rand -base64 12)
		password_hash=$(openssl passwd -6 -salt "$password_salt" "$password")
		useradd --create-home "$username" --home "/home/$username" --password "$password_hash" --shell "/bin/bash"
		[ $? -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