Ethan Rosenberg wrote:
>
> On 08/26/2013 11:36 AM, marco@xxxxxxxxxx wrote:
>>
>>
>>> Tamara Temple <tamouse.lists@xxxxxxxxx> hat am 26. August 2013 um 08:33
>>> geschrieben:
>>>
>>>
>>>
>>> On Aug 25, 2013, at 10:41 PM, Ethan Rosenberg
>>> <erosenberg@xxxxxxxxxxxxxxxxxxxx> wrote:
>>>
>>>> Dear List -
>>>>
>>>> I'm lost on this one -
>>>>
>>>> This works -
>>>>
>>>> $out = system("ls -l ",$retvals);
>>>> printf("%s", $out);
>>>>
>>>> This does -
>>>>
>>>> echo exec("ls -l");
>>
>> Please show the output of the directory listing.
>> Please us "ls -la"
>>
>>>>
>>>> This does not -
>>>>
>>>> if( !file_exists("/var/www/orders.txt"));
>>>> {
>>>> $out = system("touch /var/www/orders.txt", $ret);
>>
>> Maybe you don't have write permissions on the folder?
>>
>>>> $out2 = system("chmod 766 /var/www/orders.txt", $ret);
>>>> echo 'file2<br />';
>>>> echo file_exists("/var/www/orders.txt");
>>>> }
>>>>
>>>> and this does not -
>>>>
>>>> if( !file_exists("/var/www/orders.txt"));
>>>> {
>>>> exec("touch /var/www/orders.txt");
>>>> exec("chmod 766 /var/www/orders.txt");
>>>> echo 'file2<br />';
>>>> echo file_exists("/var/www/orders.txt");
>>>> }
>>>>
>>>> Ethan
>>>>
>>>>
>>>
>>> When you say "does not work", can you show what is actually not working?
>>> I believe the exec and system functions are likely working just fine,
>>> but that the commands you've passed to them may not be.
>>>
>>>
>>>
>> --
>> Marco Behnke
>> Dipl. Informatiker (FH), SAE Audio Engineer Diploma
>> Zend Certified Engineer PHP 5.3
>>
>> Tel.: 0174 / 9722336
>> e-Mail: marco@xxxxxxxxxx
>>
>> Softwaretechnik Behnke
>> Heinrich-Heine-Str. 7D
>> 21218 Seevetal
>>
>> http://www.behnke.biz
>>
>
> Tamara -
>
> > Please show the output of the directory listing.
> > Please us "ls -la"
>
> echo exec('ls -la orders.txt');
>
> -rw-rw-rw- 1 ethan ethan 43 Aug 25 23:50 orders.txt
>
>
> Maybe you don't have write permissions on the folder?
>
> If I perform the touch and chmod from the command line, everything works.
>
>
> >> When you say "does not work", can you show what is actually not
> working? I
> >> believe the exec and system functions are likely working just fine,
> but that
> >> the commands you've passed to them may not be.
>
> Here are my commands.
>
> if( !file_exists("/var/www/orders.txt"));
> {
> echo system("touch /var/www/orders.txt", $ret);
> echo system("chmod 766 /var/www/orders.txt", $ret);
> echo 'file2<br />';
> echo file_exists("/var/www/orders.txt");
> }
>
> If I now try a ls from the command line, the return is
> cannot access /var/www/orders.txt: No such file or directory
>
> The ls -la works because the file was created from the command line.
>
> TIA
>
> Ethan
Note that touch and chmod don't return any output, so echoing the result of
a system call for those commands will give an empty string.
You should be checking the values of $ret for each execution of system to
see whether the command was successful or not - the return status of the
executed command will be written to this variable. I'd guess that touch is
returning 13 - permission denied.
if( !file_exists("/var/www/orders.txt"))
{
system("touch /var/www/orders.txt", $ret1);
echo 'touch returned '.$ret1.'<br> /';
system("chmod 766 /var/www/orders.txt", $ret2);
echo 'chmod returned ' .$ret2.'<br> /';
echo 'file2<br />';
echo file_exists("/var/www/orders.txt"); }
Check the permissions for directory /var/www; you'll probably find it is
writable by the user you log on as, but not by the user that apache/php runs
as, which is often www - a user with limited privileges.
As other(s) have pointed out, there are php functions to do what you want
without introducing the possible insecurities involved with system et al.
--
Cheers
David Robley
"Don't try to pull the wool over my eyes," Tom said sheepishly.
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