The "co" command:

Usage: fossil checkout ?VERSION | --latest? ?OPTIONS?
or: fossil co ?VERSION | --latest? ?OPTIONS?

Check out a version specified on the command-line. This command will abort if there are edited files in the current checkout unless the --force option appears on the command-line. The --keep option leaves files on disk unchanged, except the manifest and manifest.uuid files.

The --latest flag can be used in place of VERSION to checkout the latest version in the repository.

Options:

--force
Ignore edited files in the current checkout
--keep
Only update the manifest and manifest.uuid files
--force-missing
Force checkout even if content is missing
--setmtime
Set timestamps of all files to match their SCM-side times (the timestamp of the last checkin which modified them).