To gracefully restart the Lighttpd web server on a Linux or Unix system, you can use the lighttpd command with the -f option followed by the path to the configuration file.
Here is an example of how to gracefully restart the Lighttpd web server:
lighttpd -f /etc/lighttpd/lighttpd.conf
This will read the Lighttpd configuration file at /etc/lighttpd/lighttpd.conf and gracefully restart the web server.
A graceful restart allows the Lighttpd web server to finish processing any existing requests and then shut down, allowing new requests to be processed when the server is restarted. This is in contrast to a hard restart, which abruptly shuts down the server and may cause existing requests to be lost.
Note that the path to the Lighttpd configuration file may vary depending on your system configuration. You may need to adjust the path to the configuration file as needed.