The "sync" command:

Usage: fossil sync ?URL? ?options?

Synchronize all sharable changes between the local repository and a
remote repository.  Sharable changes include public check-ins and
edits to wiki pages, tickets, and technical notes.

If URL is not specified, then the URL from the most recent clone, push,
pull, remote-url, or sync command is used.  See "fossil help clone" for
details on the URL formats.

Options:

  -B|--httpauth USER:PASS    Credentials for the simple HTTP auth protocol,
                             if required by the remote website
  --ipv4                     Use only IPv4, not IPv6
  --once                     Do not remember URL for subsequent syncs
  --proxy PROXY              Use the specified HTTP proxy
  --private                  Sync private branches too
  -R|--repository REPO       Local repository to sync with
  --ssl-identity FILE        Local SSL credentials, if requested by remote
  --ssh-command SSH          Use SSH as the "ssh" command
  -u|--unversioned           Also sync unversioned content
  -v|--verbose               Additional (debugging) output
  --verily                   Exchange extra information with the remote
                             to ensure no content is overlooked

See also: clone, pull, push, remote-url