# File lib/autumn/tool/bin.rb, line 50
        def find_pid(pid_file) # {{{
          if pid_file.nil? or not File.file?(pid_file)
            pid_file = default_pidfile
          end
          unless File.file?(pid_file)
            $stderr.puts "Could not find running process id."
            return false
          end
          pid_file
        end