a more sophisticated way of getting the script directory

scripts/update_coco.sh

 #!/bin/bash
-cd /var/www/html/technical/scripts; /usr/bin/php CoCointerface.php 1> /dev/null 2>>/var/log/coco_error.log
-
+spath="$(readlink -n -f "$0")"
+cd "$(dirname "$spath")"
+/usr/bin/php CoCointerface.php 1> /dev/null 2>>/var/log/coco_error.log