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Top Forums Shell Programming and Scripting Encapsulating output of CURL and/or WGET Post 302706851 by SkySmart on Thursday 27th of September 2012 01:59:17 PM
Old 09-27-2012
Quote:
Originally Posted by Corona688
How about just letting it print instead of continually cramming everything into backticks? You don't have to always have to do that.

Also, how about checking their return codes instead of grepping their output? Every process you create returns an error code for success or failure, and wget is not an exception. If it fails to download a page, it willl tell you so directly. There's no need to grep for 'error' in the output.

If you're downloading multiple pages and wish to see which succeeded via script, wget has the -nv option, which outputs success or failure for individual files in a simple line-by-line list.

The real problem is, they're not one thing, they're two streams. stdout is used for data, stderr is used for errors.

If you want them both to go to stdout: wget ... 2>&1
thank you for the response.

the task i often have to deal with is, some clients request that a specific URL be curled/wgetted and in the output returned, they want to make sure that there is a certain string(s) contained in it.

so in the previous wget example i gave (its just an example), some clients may want to make sure the words "HTTP request sent, awaiting response" is found in the output. in such a case, just checking for the exit code is not good enough. it helps if, when the check alerts, it also contains the full error message.

lets say the exit code is a non-zero. it would help tremendously to actually be able to see what the failure was.

for instance, after running a wget on a URL, the following was returned:

Code:
<detail><vXMLVersion>0.0.1</vXMLVersion><addressAndMailPieceInformation><vError>Fatal exception during validationjava.lang.NullPointerException</vError></addressAndMailPieceInformation></detail>


Now, this isn't the typical response. So when the URL check was run and got back this error response, it would help if I can actually show the entire message to the output of the GUI. its very difficult putting this response in a variable and outputting it out the way it alerted.

see what i mean?
 

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curl_easy_escape(3)						  libcurl Manual					       curl_easy_escape(3)

NAME
curl_easy_escape - URL encodes the given string SYNOPSIS
#include <curl/curl.h> char *curl_easy_escape( CURL *curl, const char *string , int length ); DESCRIPTION
This function converts the given input string to a URL encoded string and returns that as a new allocated string. All input characters that are not a-z, A-Z, 0-9, '-', '.', '_' or '~' are converted to their "URL escaped" version (%NN where NN is a two-digit hexadecimal number). If length is set to 0 (zero), curl_easy_escape(3) uses strlen() on the input string to find out the size. You must curl_free(3) the returned string when you're done with it. AVAILABILITY
Added in 7.15.4 and replaces the old curl_escape(3) function. RETURN VALUE
A pointer to a zero terminated string or NULL if it failed. EXAMPLE
CURL *curl = curl_easy_init(); if(curl) { char *output = curl_easy_escape(curl, "data to convert", 15); if(output) { printf("Encoded: %s ", output); curl_free(output); } } SEE ALSO
curl_easy_unescape(3), curl_free(3), RFC3986 libcurl 7.54.0 February 03, 2016 curl_easy_escape(3)
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