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Full Discussion: how to proceed when curl is finished
Top Forums Shell Programming and Scripting how to proceed when curl is finished Post 302689585 by locoroco on Tuesday 21st of August 2012 05:54:48 PM
Old 08-21-2012
how to proceed when curl is finished
I have a script which uses cli curl to download the source code of a webpage and then tests if a specific string exists in the source.

The problem is that the website has a slow response, so the eval expression hasn't completed when the test starts.

The test returns a negative, and the curl completes right after the test and changes the source.html. The test should have been positive, but ran too soon.

How do I make the test wait until curl has finished? Do I have to sleep for a few seconds, or is there another way?

Code:
string=$(echo "curl -d "'"'$datastring'"'" -b cookie.txt -c cookie.txt -L "$url)
eval $string > source.html
teststring=$(awk '/text/' source.html)

The curl progress line is still showing after the test has been completed.

---------- Post updated at 11:54 PM ---------- Previous update was at 11:50 PM ----------

If I put
Code:
 > source.html

into the string it still doesn't work. The script has already completed when I receive the source a few seconds later.

Code:
string=$(echo "curl -d "'"'$datastring'"'" -b cookie.txt -c cookie.txt -L "$url" > source.html") 
eval $string 
teststring=$(awk '/text/' source.html)

 

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LEARN ABOUT MOJAVE

curlopt_tcp_keepintvl

CURLOPT_TCP_KEEPINTVL(3)				     curl_easy_setopt options					  CURLOPT_TCP_KEEPINTVL(3)

NAME

       CURLOPT_TCP_KEEPINTVL - set TCP keep-alive interval

SYNOPSIS

       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_TCP_KEEPINTVL, long interval);

DESCRIPTION

       Pass a long. Sets the interval, in seconds, that the operating system will wait between sending keepalive probes. Not all operating systems
       support this option. (Added in 7.25.0)

DEFAULT

       60

PROTOCOLS

       All

EXAMPLE

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

	 /* enable TCP keep-alive for this transfer */
	 curl_easy_setopt(curl, CURLOPT_TCP_KEEPALIVE, 1L);

	 /* set keep-alive idle time to 120 seconds */
	 curl_easy_setopt(curl, CURLOPT_TCP_KEEPIDLE, 120L);

	 /* interval time between keep-alive probes: 60 seconds */
	 curl_easy_setopt(curl, CURLOPT_TCP_KEEPINTVL, 60L);

	 curl_easy_perform(curl);
       }

AVAILABILITY

       Always

RETURN VALUE

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

SEE ALSO

       CURLOPT_TCP_KEEPALIVE(3), CURLOPT_TCP_KEEPIDLE(3),

libcurl 7.54.0							 January 02, 2017					  CURLOPT_TCP_KEEPINTVL(3)
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