How to Write sftp through "expect" for file upload ?

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curlopt_resume_from_large

CURLOPT_RESUME_FROM_LARGE(3)				     curl_easy_setopt options				      CURLOPT_RESUME_FROM_LARGE(3)

NAME

       CURLOPT_RESUME_FROM_LARGE - set a point to resume transfer from

SYNOPSIS

       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_RESUME_FROM_LARGE,
				 curl_off_t from);

DESCRIPTION

       Pass a curl_off_t as parameter. It contains the offset in number of bytes that you want the transfer to start from. Set this option to 0 to
       make the transfer start from the beginning (effectively disabling resume). For FTP, set this option to -1 to make the transfer  start  from
       the end of the target file (useful to continue an interrupted upload).

       When doing uploads with FTP, the resume position is where in the local/source file libcurl should try to resume the upload from and it will
       then append the source file to the remote target file.

DEFAULT

       0, not used

PROTOCOLS

       HTTP, FTP, SFTP, FILE

EXAMPLE

       CURL *curl = curl_easy_init();
       if(curl) {
	 curl_off_t resume_position = GET_IT_SOMEHOW;
	 curl_off_t file_size = GET_IT_SOMEHOW_AS_WELL;

	 curl_easy_setopt(curl, CURLOPT_URL, "ftp://example.com");

	 /* resuming upload at this position, possibly beyond 2GB */
	 curl_easy_setopt(curl, CURLOPT_RESUME_FROM_LARGE, resume_position);

	 /* ask for upload */
	 curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);

	 /* set total data amount to expect */
	 curl_easy_setopt(curl, CURLOPT_INFILESIZE_LARGE, file_size);

	 /* Perform the request */
	 curl_easy_perform(curl);
       }

AVAILABILITY

       Added in 7.11.0

RETURN VALUE

       Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.

SEE ALSO

       CURLOPT_RESUME_FROM(3), CURLOPT_RANGE(3), CURLOPT_INFILESIZE_LARGE(3),

libcurl 7.54.0							 February 03, 2016				      CURLOPT_RESUME_FROM_LARGE(3)

Shell Programming and Scripting