create multiple users at once on Ubuntu

usercreate.sh

#!/bin/bash

# Batch creates users
# Tested on Ubuntu Server 16.04
# author: Austin Barrett
# thanks to  Surendra Anne | http://www.linuxnix.com/create-multiple-users-linux/

if [[ -z $1 ]]; then
    echo -e "Script Usage:\n\t./$(basename $0) user1 user2 user3... userN"
    exit 1
fi

for i in $@
do
    # adds user
    useradd $i

    # generates password
    password=$(< /dev/urandom tr -dc A-Na-n1-9_ | head -c8 )

    # sets user password
    echo -e "$password\n$password" | passwd $i

    # adds current user to master password list
    echo -e "Username:$i" > /home/admin/useraccounts
    echo -e "password:$password\n" >> /home/admin/useraccounts

    # Configuring default shell as bash and setting up user home directories
    usermod -s /bin/bash $i
    mkhomedir_helper $i
done