-f, --force if the entry already exists - re-write it, if
<bootdir>/loader/loader.conf does not exist - create one,
if <bootdir>/<kernel> does not exist - do not fail
-f, --force if the entry already exists - re-write it, if
<bootdir>/loader/loader.conf does not exist - create one,
if <bootdir>/<kernel> does not exist - do not fail