Sorry about that, the copy/paste I did to the comment area lost the formatting when converting to html, thats why it didn't work - there is a missing << EOF

SITE='http://www.yoursite.com'
mysql --defaults-extra-file=/etc/mysql/debian.cnf <<EOF
USE wordpress;
UPDATE wp_options SET option_value='$SITE' WHERE option_name='home';
UPDATE wp_options SET option_value='$SITE' WHERE option_name='siteurl';
EOF