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Posted by Jerry Stuckle on 03/23/07 22:31
Chr1s wrote:
> On Mar 23, 2:50 pm, Erwin Moller
> <since_humans_read_this_I_am_spammed_too_m...@spamyourself.com> wrote:
>> Erwin Moller wrote:
>>> Chr1s wrote:
>>>> How do I execute a crontab command using php (not CLI) as user Joe?
>>>> I don't have any problem getting output from commands such as 'ls'
>>>> using passthru and exec but I am stumped with crontab.
>>>> Many thanks!
>>>> Chris
>>> Hi Chris,
>>> 1) user Joe:
>>> If you want user Joe to execute the cronjob, login as use Joe and edit his
>>> cronjob by typing:
>>> crontab -e
>>> Now the contab program opens Joe's cronjobs.
>>> Most systems open in VI editor, since I hate that thing because I am a
>>> nOOb, I prefer opening in pico: a small editor that works like a human
>>> brain, unlike VI (shoot me if you want. :P).
>>> If you want pico (or nano) too, type first:
>>> export EDITOR=pico
>>> then give the crontab -e command.
>>> 2) shedule
>>> add a line like this (all on 1 line):
>>> 0 1 * * * cd /home/yourdir/public_html/ && php -q
>>> /home/yourdir/public_html/yoursheduledscript.php
>>> to let the script run each night at 1 o'clock.
>>> I am not sure about the cd, but had trouble using a script without cd-ing
>>> to the dir first.
>>> Hope that helps.
>>> Good luck.
>>> Regards,
>>> Erwin Moller
>> One addition: when hunting for problems think of the cronjob as:
>> 1) login as user Joe
>> 2) Joe gives the commands by hand.
>>
>> So if your script isn't doing what you want, you can always try to find what
>> is wrong by doing excactly the same thing being Joe.
>>
>> Good luck.
>>
>> Regards,
>> Erwin Moller- Hide quoted text -
>>
>> - Show quoted text -
>
> Apologies, I should have been more specific.
>
> I want to append to a user's crontab using a php script...not run a
> script from crontab.
>
> For example,
>
> exec('crontab MyFile', $var);
>
> I don't know how to adapt this code to work for user 'Joe'?
>
> Thanks,
>
> Chris
>
Chris,
Then you're going to have to su to user Joe or otherwise have permission
to open/read/write Joe's crontab. You can do it with posix_seteuid() or
posix_setuid() - but these are dangerous - you have to enable the change
SUID bit for PHP which potentially allows any PHP script to set any
userid, including root. Not very safe.
A better way would be to execute a shell script which has permission to
change the uid and add to the crontab. This limits your exposure.
--
==================
Remove the "x" from my email address
Jerry Stuckle
JDS Computer Training Corp.
jstucklex@attglobal.net
==================
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