"Ethan Rosenberg, PhD" wrote:
>
>
> Ethan Rosenberg, PhD
> /Pres/CEO/
> *Hygeia Biomedical Research, Inc*
> 2 Cameo Ridge Road
> Monsey, NY 10952
> T: 845 352-3908
> F: 845 352-7566
> erosenberg@xxxxxxxxxxxxxxxxxxxx
>
> On 08/26/2013 07:33 PM, David Robley wrote:
>> 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.
>>
>
> David -
>
> touch returned 1
> /chmod returned 1
>
Non-zero return value indicates an error; touch failed and as a result there
is no file to chmod, hence chmod also failed.
> rosenberg:/var/www# ls orders.txt
> ls: cannot access orders.txt: No such file or directory
>
> rosenberg:/var# ls -ld www
> drwxr-xr-x 37 ethan ethan 20480 Aug 26 20:15 www
/var/www is only writeable by the user ethan
--
Cheers
David Robley
INTERLACE: To tie two boots together.
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