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From: "J.O. Aho" <user@example.net>
Newsgroups: comp.lang.php
Subject: Re: problems with exec()
Date: Mon, 16 Apr 2012 07:17:53 +0200
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M. Strobel wrote:
> Am 16.04.2012 00:16, schrieb M. Strobel:
>> Am 15.04.2012 19:43, schrieb J.O. Aho:
>>> 7segment wrote:
>>>> Hi.
>>>>
>>>> I have an interesting problem and I cannot figure out what the problem
>>>> might be.
>>>>
>>>> This does not  produce any output:
>>>>
>>>> $response = exec('ifconfig');
>>>> echo $response;
>>>>
>>>> Although when I try other commands, I get a response on the screen. So I
>>>> don't get what's so special about ifconfig.
>>>>
>>>> Could anyone help please?
>>>
>>> ifconfig usually residence in /sbin (some GNU/Linux distribution are in the migration
>>> path of moving it to /usr/sbin), this directory  is never in a normal users or a
>>> daemon users $PATH, so you need to give the whole path to this binary to be able to
>>> run it.
>>>
>>> By default the file is executional by all users, but someone may have changed
>>> permissions or setup ACL rules with for example SELinux.
>>>
>>
>> I can tell that on opensuse it it not executable by normal users.
>>
>
> Correct is: on suse it is not found on the path. When called with path /sbin/ifconfig
> in a shell it outputs the NIC configuration. When called like that it outputs nothing:
>
> php>  $a = exec('/sbin/ifconfig');
> php>  echo $a;
> php>  var_dump($a);
> string(0) ""

Think the ifconfig makes a bit environment check and wants a shell, use 
shell_exec instead and you will see the output.


-- 

   //Aho