code: function({options}, succeed, skip) {
      var ssh;
      // SSH connection
      ssh = this.ssh(options.ssh);
      return each(options.should_exist).call(function(should_exist, next) {
        return fs.exists(ssh, should_exist, function(err, exists) {
          if (exists) {
            return next();
          } else {
            return next(Error(`File does not exist: ${should_exist}`));
          }
        });
      }).error(skip).next(succeed);
    }
docs: The callback `succeed` is called if all of the provided paths exists otherwise the callback `skip` is called with an error.