diff (Capistrano::Deploy::SCM::Cvs)

    # File lib/capistrano/recipes/deploy/scm/cvs.rb, line 45
            def diff(from, to=nil)
              rev_type = revision_type(from)
              if rev_type == :date
                range_args = "-D '#{from}' -D '#{to || 'now'}'"
              else
                range_args = "-r '#{from}' -r '#{to || head}'"
              end
              scm cvs_root, :diff, range_args
            end