How to segregate a section from big file?

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curlopt_range

CURLOPT_RANGE(3)					     curl_easy_setopt options						  CURLOPT_RANGE(3)

NAME

       CURLOPT_RANGE - set byte range to request

SYNOPSIS

       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_RANGE, char *range);

DESCRIPTION

       Pass a char * as parameter, which should contain the specified range you want to retrieve. It should be in the format "X-Y", where either X
       or Y may be left out and X and Y are byte indexes.

       HTTP transfers also support several intervals, separated with commas as in "X-Y,N-M". Using this kind of multiple intervals will cause  the
       HTTP server to send the response document in pieces (using standard MIME separation techniques). Unfortunately, the HTTP standard (RFC 7233
       section 3.1) allows servers to ignore range requests so even when you set CURLOPT_RANGE(3) for a request, you may end up getting  the  full
       response sent back.

       For RTSP, the formatting of a range should follow RFC2326 Section 12.29. For RTSP, byte ranges are not permitted. Instead, ranges should be
       given in npt, utc, or smpte formats.

       Pass a NULL to this option to disable the use of ranges.

       The application does not have to keep the string around after setting this option.

DEFAULT

       NULL

PROTOCOLS

       HTTP, FTP, FILE, RTSP and SFTP.

EXAMPLE

       CURL *curl = curl_easy_init();
       if(curl) {
	 curl_easy_setopt(curl, CURLOPT_URL, "http://example.com");

	 /* get the first 200 bytes */
	 curl_easy_setopt(curl, CURLOPT_RANGE, "0-199");

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

AVAILABILITY

       FILE since 7.18.0, RTSP since 7.20.0

RETURN VALUE

       Returns CURLE_OK on success or CURLE_OUT_OF_MEMORY if there was insufficient heap space.

SEE ALSO

       CURLOPT_RESUME_FROM(3),

libcurl 7.54.0							 December 21, 2016						  CURLOPT_RANGE(3)

Shell Programming and Scripting