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Top Forums Shell Programming and Scripting Curl parallel download file list Post 302997866 by tonispa on Sunday 21st of May 2017 12:27:14 PM
Old 05-21-2017
Curl parallel download file list

Hello guys, first post sorry if I did some mess here =)

Using Ubuntu 14.04lts 64bits server version.

I have a list (url.list) with only URLs to download, one per line, that looks like this:
Code:
http://domain.com/teste.php?a=2&b=3&name=1
http://domain.com/teste.php?a=2&b=3&name=2
...
http://domain.com/teste.php?a=2&b=3&name=30000

As you can see, there are many lines in the file (in this case 30000). Because of that I'm using a trick to download many URLs simultaneosly with this:
Code:
cat url.list | xargs -n 1 -P 10 <<MAGIC COMMAND THAT WILL SAVE ME>>

The problem is that I'd like to rename the output file with the same value of the name field, like: 1.html, 2.html, ..., 30000.html ecc, and use curl to limit the size of the file to 50KB. So the curl command should be something like:
Code:
curl -r 0-50000 -L $URL -o $filename.html -a $filename.log

How can I have it done? Smilie

I can parse the output of the pipe with echo $URL | sed -n -e 's/^.*name=//p' but I don't know how use this in the same line grabbing the output of a pipe in 2 variables ($URL and $filename).

I tried this with no success:
Code:
cat url.list | xargs -n 1 -P 10 | filename=$(sed -n -e 's/^.*name=//p') ; curl -r 0-50000 -L $URL -o $filename.html -a $filename.log

Thank you in advance,
tonispa

Last edited by tonispa; 05-21-2017 at 01:58 PM..
 

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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, char *url, int length ); DESCRIPTION
This function converts the given input string to an 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 num- ber). If the length argument is set to 0 (zero), curl_easy_escape(3) uses strlen() on the input url 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. SEE ALSO
curl_easy_unescape(3), curl_free(3), RFC2396 libcurl 7.15.4 7 April 2006 curl_easy_escape(3)
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