FTP Bash script for auto file transfer and backup

#!/bin/bash

ftp_site=ftp://yoursite.com
username=roger
passwd=abc123
backupdir=$HOME
filename="backup-$(date '+%F-%H%M').tar.gz"

echo "Creating a backup file $filename of $backupdir."

# Make a tar gzipped backup file
tar -cvzf  "$filename" "$backupdir"

ftp -in <<EOF
open $ftp_site
user $username $passwd
bin
put $filename 
close 
bye
EOF