code: func (e ExecError) ShortError() string {
  	outStr := e.truncateStr(e.StdOut, execShortErrorMaxLines)
  	errStr := e.truncateStr(e.StdErr, execShortErrorMaxLines)
  	return fmt.Sprintf(execErrorMsgFmt, e.Command, outStr, errStr)
  }
docs: // ShortError returns an error message that has stdout/stderr truncated.