Check pagerank with your linux shell and cron and get email updates!

**Rob** · 11-06-2012, 12:28 PM

I set this up on one of my servers recently and love it. I get emails every 6 hours (6am, 12pm, 6pm, 12am) with pagerank results for all of my sites on the list..

First, download the pagerank script created by http://zhiwei.li/
(its below - their site was broken at the time of this writing)



/******************************************************************************

 * Filename     : pagerank.c

 * Description  : Google PageRank Checksum Algorithm 

 * Author       : [url]http://zhiwei.li/[/url]

 * Log          : Ver 0.1 2005-9-13  first release

 *                Ver 1.0 2005-10-19  fixed :final character bug

 *                Ver 1.1 2006-10-05  refine code

 *                Ver 1.2 2008-8-20   use boolean type

 *******************************************************************************/





#include <stdio.h>

#include <stdbool.h>





int ConvertStrToInt(char *pStr, int Init, int Factor)

{

    while (*pStr) {

        Init *= Factor;

        Init += *pStr++;

    }

    return Init;

}





int HashURL(char *pStr)

{

    unsigned int C1, C2, T1, T2;





    C1 = ConvertStrToInt(pStr, 0x1505, 0x21);

    C2 = ConvertStrToInt(pStr, 0, 0x1003F);

    C1 >>= 2;

    C1 = ((C1 >> 4) & 0x3FFFFC0) | (C1 & 0x3F);

    C1 = ((C1 >> 4) & 0x3FFC00) | (C1 & 0x3FF);

    C1 = ((C1 >> 4) & 0x3C000) | (C1 & 0x3FFF);





    T1 = (C1 & 0x3C0) << 4;

    T1 |= C1 & 0x3C;

    T1 = (T1 << 2) | (C2 & 0xF0F);





    T2 = (C1 & 0xFFFFC000) << 4;

    T2 |= C1 & 0x3C00;

    T2 = (T2 << 0xA) | (C2 & 0xF0F0000);





    return (T1 | T2);

}





char CheckHash(unsigned int HashInt)

{

    int Check = 0;

    bool Flag = false;

    int Remainder;





    do {

        Remainder = HashInt % 10;

        HashInt /= 10;

        if (Flag){

            Remainder += Remainder;

            Remainder = (Remainder / 10) + (Remainder % 10);

        }

        Check += Remainder;

        Flag = !Flag;

    } while( 0 != HashInt);





    Check %= 10;

    if (0 != Check) {

        Check = 10 - Check;

        if (Flag) {

            if (1 == (Check % 2)) {

                Check += 9;

            }

            Check >>= 1;

        }

   }

    Check += 0x30;

    return Check;

}





int main(int argc, char* argv[])

{

    unsigned int HashInt;





    if (argc != 2) {

        printf("Usage: %s [URL]\n",argv[0]);

        return 1;

    }





    HashInt = HashURL(argv[1]);

    printf("Checksum=7%c%u\n", CheckHash(HashInt), HashInt);

    return 0;

}

This is C source code, so save it as 'pagerank.checksum.c' and then compile it by typing:

Code:

gcc -o pagerank.checksum pagerank.checksum.c

This will create the binary 'pagerank.checksum'.

Test it out by typing:

Code:

./pagerank.checksum google.com

You should see something like:

Code:

[root@iqb62 bin]# ./pagerank.checksum google.com
Checksum=783326521420

Ok, now, create a new file named 'pagerank.sh' and enter the following into it:



#!/bin/bash

page=$1

page_encoded=`echo $page | sed 's/\//%2F/g;s/:/%3A/g'`

checksum=`/usr/local/bin/pagerank.checksum $page | sed 's/Checksum=//'`

pr_request="http://toolbarqueries.google.com/tbr?client=navclient-auto&ch=$checksum&ie=UTF-8&oe=UTF-8&features=Rank&q=info:$page_encoded"

curl -s "$pr_request" | cut -d":" -f3

And test it out like:

Code:

./pagerank.sh google.com

Ok, now - lets set it up to run from cron and email you the results!

Create a file named 'pages.to.check.txt' in /usr/local/bin and line by line enter the domains to check:

Code:

www.linuxhostingtalk.com
www.google.com
www.yahoo.com
www.linux.org

Create another file in /usr/local/bin/ called 'check_pageranks.sh' and put this into it:

Code:

#!/bin/bash
/bin/rm -f /usr/local/bin/results
for URL in `cat /usr/local/bin/pages.to.check.txt`; do echo -e "$URL\t$(/usr/local/bin/pagerank.sh $URL)" >> /usr/local/bin/results; done
mail -s "Google Page Rank Results" your-email@domain.com < /usr/local/bin/results

And last but not least, create a cron job for the script to kick off - lets do it at 6am, 12pm and 6pm..

Code:

00 6,12,18 * * * /usr/local/bin/check_pageranks.sh >/dev/null 2>&1

And there you go - now you'll get an email 3 times/day with your pageranks! If you want to do it the old fashioned way, then visit Check-Pagerank.org :)