bash script create user

#!/bin/bash
genpasswd() {
        local l=$1
        [ "$l" == "" ] && l=5
        tr -dc a-z < /dev/urandom | head -c ${l} | xargs
}

checkuser() {
   getent passwd $USERNAME > /dev/null 2&>1
   if [ $? -eq 0 ]; then
    return 1
   else
    return 0
   fi
}

createuser() {
   useradd $USERNAME -d /home/$GROUP/$USERNAME/ -s /bin/false -G $GROUP
   cd /home/$GROUP
   chown root:root $USERNAME
   chmod 755 $USERNAME
   cd /home/$GROUP/$USERNAME/
   mkdir public_html
   cd $HTDOC
   mkdir $FOLDER
   echo "mount --bind $HTDOC/$FOLDER /home/$GROUP/$USERNAME/public_html" | sudo tee -a $RUNBIND
   echo $GENPASS | sudo passwd --stdin $USERNAME
   mount --bind $HTDOC/$FOLDER /home/$GROUP/$USERNAME/public_html
   cd /home/$GROUP/$USERNAME/
   chown $USERNAME:apache public_html
   chmod 775 -R public_html
   chmod g+s -R public_html
   chmod u+s -R public_html
}



cetak(){
   echo "+----------------------------------+"
   echo "|    User Account Information      |"
   echo "+----------------------------------+"
   echo "  SFTP :-                         "
   echo "  Username : $USERNAME            "
   echo "  Password : $GENPASS             "
   echo "                                  "
   echo "   *** Done $(date) ***      "
   echo "                                  "
   echo "+----------------------------------+"
}

clear
echo "***********************************************************************"
echo "*           Welcome to SFTP Only Shell Account Creator                *"
echo "***********************************************************************"
echo ""
ROOTUSER=""
ROOTPASS=""
HTDOC="/var/www/html"
RUNBIND="/opt/runbind.sh"
GROUP="sftponly"
GENPASS=$(genpasswd)
echo "---> SFTP INFO <---"
read -p "Enter Username for SFTP : " USERNAME
read -p "Enter Folder in WWW: " FOLDER
ROOTUSER="root"
echo "Folder in www: $FOLDER"
echo "---> MySQL INFO <---"
echo "Root user :->root"
echo ""
NEWUSER=$USERNAME

if checkuser -eq 0; then
   createuser
   cetak
   exit
else
   echo "error"
   exit
fi