sudo cp /var/www/html/wp-config.php /var/www/html/wp-config.php.bak4
sudo tee /var/www/html/wp-config.php > /dev/null << 'EOF'
<br />
<b>Warning</b>:  Cannot modify header information - headers already sent by (output started at /var/www/html/wp-config.php:1) in <b>/var/www/html/wp-includes/pluggable.php</b> on line <b>1531</b><br />
<br />
<b>Warning</b>:  Cannot modify header information - headers already sent by (output started at /var/www/html/wp-config.php:1) in <b>/var/www/html/wp-includes/pluggable.php</b> on line <b>1534</b><br />