The "test-backlinks" command:
Usage: fossil test-backlinks SRCTYPE SRCID ?OPTIONS? INPUT-FILE
Read the content of INPUT-FILE and pass it into the backlink_extract() routine. But instead of adding backlinks to the backlink table, just print them on stdout. SRCID and SRCTYPE are integers.
Options:
- --mtime DATETIME
 - Use an alternative date/time. Defaults to the current date/time.
 - --mimetype TYPE
 - Use an alternative mimetype.