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Old 05-27-2008, 09:21 AM   #1
Sambojambo
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Registered: Feb 2008
Location: UK
Distribution: Ubuntu - Hardy Heron
Posts: 10

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apache php - executing commands using system(), problems


I sure that there's going to be a quick answer to this. I'm calling a command through the system() function in php.

PHP Code:
$cmd 'tide -ml -fh -o $output ';
system($cmd); 
When I run the script through www-data it won't execute. I've checked the permissions on the bin and it looks fine. I'm confused as www-data can execute other bins in the same folder with the same permissions. This is on a standard install of Ubuntu Hardy.

Code:
sam@nugget:/$ ls -la /usr/bin/tide | grep tide
-rwxr-xr-x 1 root root 370852 2008-04-03 21:53 /usr/bin/tide
I'm not the most experienced system admin - I must be missing something obvious?

Thanks in advance for any help
 
Old 05-27-2008, 11:32 AM   #2
Hko
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Registered: Aug 2002
Location: Groningen, The Netherlands
Distribution: ubuntu
Posts: 2,530

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One thing is wrong dor sure: When using single quotes (' '), as you did, the variable $output will not be replaced with the value of $output. Use double quotes (" ") instead.

Also, what is the value of $output? Can www-data really write there?
You can Check with this: $cmd = "tide -ml -fh -o $output 2>&1"; Any errors from the 'tide' program will show in you browser.

I noticed 'tide' outputs html code. You could also try without the -o $output part first. The html from 'tide' will show nicely in the browser.

Complete example:
PHP Code:
<html>
    <head>
        <title>Tides</title>
    </head>
    <body>
        <?php
            $output 
'/tmp/tide.html';
            
$cmd "tide -ml -fh";
            
// $cmd = "tide -ml -fh -o $output 2>&1";
            // $cmd = "tide -ml -fh -o $output";
            
system($cmd);
        
?>
    </body>
</html>

Last edited by Hko; 05-27-2008 at 11:37 AM.
 
Old 05-28-2008, 05:19 AM   #3
Sambojambo
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Registered: Feb 2008
Location: UK
Distribution: Ubuntu - Hardy Heron
Posts: 10

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Late night silly mistake...

Thanks for your reply Hko - and your simple script help pin down my silly mistake quickly. Apache was unable to write to the $output file which I was soon able to see with '2>&1'. The single/double quote issue was just a typo in the post.

Thanks again
 
Old 05-29-2008, 11:52 AM   #4
seraphim172
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Registered: May 2008
Posts: 101

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Just a note in general: If you run any system commands in PHP be prepared for time-out problems if the operations takes long to finish. Fore example, calling ghostscript to merge a set of PDF files can take longer than the web server allows the PHP process to run. This is often a problem with osCommerce modules.

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Last edited by seraphim172; 06-25-2008 at 04:42 AM.
 
  


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