It works as I expected.
Thanks.

On Thu, Jan 25, 2018 at 9:08 PM, Michael Albinus <michael.albinus@gmx.de>
wrote:

> Shuguang Sun <shuguang@gmail.com> writes:
>
> > Hi,
>
> Hi Shuguang,
>
> > The shell-command-to-string calls shell-file-name directly and it
> > doesn't work in the case of local Windows and remoter Unix. I borrow
> > the some code from shell.el and make a patch to simple.el.
>
> I believe it is wrong to make `shell-command-to-string' Tramp-aware. We
> have `shell-command', which runs a (Tramp) file name handler if
> needed. The proper change should be:
>
> --8<---------------cut here---------------start------------->8---
> diff --git a/lisp/simple.el b/lisp/simple.el
> index e51bc132a6..44f738f07e 100644
> --- a/lisp/simple.el
> +++ b/lisp/simple.el
> @@ -3844,7 +3844,7 @@ shell-command-to-string
>    (with-output-to-string
>      (with-current-buffer
>        standard-output
> -      (process-file shell-file-name nil t nil shell-command-switch
> command))))
> +      (shell-command command t))))
>
>  (defun process-file (program &optional infile buffer display &rest args)
>    "Process files synchronously in a separate process.
> --8<---------------cut here---------------end--------------->8---
>
> Could you, pls, test it in your environment?
>
> > Best Regards,
> > Shuguang
>
> Best regards, Michael.
>