This file is indexed.

/usr/bin/sabredav is in php-sabre-dav 1.8.12-3ubuntu2.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#!/bin/sh
php -S 0.0.0.0:8080 `dirname $0`/../share/php/Sabre/sabredav.php