#!/bin/sh sudo killall -9 lighttpd sudo killall -9 ruby sudo /opt/local/sbin/lighttpd -f /opt/local/etc/lighttpd.conf
Make the script executable (chmod u+x), put it in your path, invoke by simply typing the name of the script. This also kills off any ruby processes, which lighttpd will restart when it reboots.
The path to lighttpd and the lighttpd.conf files are based on the installation from DarwinPorts - adjust as needed.