code: function (cmd, cwd) {
        return execute(cmd, cwd ? path.resolve(target, cwd) : target)
      }
docs: /*
  Execute a child process at the specified working directory, relative to
  the target.
  @param {String} cmd - the command to run.
  @param {string} cwd - the working directory, relative to the target
  @return {Promise} - a promise for the standard out.