Robert Cummings schreef:
> On Tue, 2009-03-03 at 11:27 -0500, PJ wrote:
>> Shawn McKenzie wrote:
>>> PJ wrote:
>>>
>>>> This really needs some explanation
>>>> I found this on the web:
>>>> <?php echo `whoami`; ?>
>>>> with it there was the comment "the direction of those single-quotes matters"
>>>> (WHY ?)
>>>> and it works....
>>>>
>>>> But this (_*FROM THE PHP MANUAL***_ * - exec()* executes the given
>>>> /command/ ) does not,
>>>> COPIED AND PASTED:
>>>> |<?php
>>>> // outputs the username that owns the running php/httpd process
>>>> // (on a system with the "whoami" executable in the path)
>>>> echo exec('whoami');
>>>> ?> |
>>>> What is going on here?
>>>> And I often find such discrepancies in examples - and some wonder why I
>>>> seem to be so stupid... and don't know the fundamentals... :-\
>>>>
>>> Others have shown how exec() returns the output. If you use
>>> shell_exec() it's the same as using the backticks:
>>>
>>> <?php echo `whoami`; ?>
>>>
>>> -or-
>>>
>>> <?php echo shell_exec("whoami"); ?>
>>>
>>> You can use single quotes here also, i used double so you can easily
>>> tell they are not backticks
>>>
>> What is not clear to me is why would I need to use a shell? What kind of
>> situations call for it's use?
>
> You must be a point and clicker.
a PACman.
> Many, many, many people use the shell
> to perform basic system administration, edit config files, even edit
> source code. There are thousands of shell commands available at the
> touch of your fingertips while in a shell. Using the backticks or exec()
> function allows one to utilize these programs as part of a larger
> program.
of course the real answer is "no-one can explain who you are, you have to
find out for yourself"
>
> Cheers,
> Rob.
--
PHP General Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php
