Exec and Redirecting Output

[btysgtmajor@gmail.com]

Hi all,

I've searched high and low on this group and elsewhere and can't
really seem to find an answer to this question. I'm running PHP4 on a
Debian box with Apache. I'm trying to run the "exec" command
withsomething fairly simple like "cat", e.g. exec("cat < a.txt >
b.txt");. I'm noticing that no matter what kind of
redirecting/piping/whatever you want to call it I do, the redirections
don't work (at least the redirecting of the output). I can run the
same command from the command line and it works (of course).

Is this some kind of permissions deal? I've tried making the call to
be in places where a.txt and b.txt are in a directory that have R/W/X
permissions for PHP (I chose a directory that I actually can
successfully use the fopen et al commands with, including writing).

Does anyone have any ideas?

Thanks in advance!

[Jerry Stuckle]

Re: Exec and Redirecting Output

btysgtmajor@gma il.com wrote:

Hi all,
>
I've searched high and low on this group and elsewhere and can't
really seem to find an answer to this question. I'm running PHP4 on a
Debian box with Apache. I'm trying to run the "exec" command
withsomething fairly simple like "cat", e.g. exec("cat < a.txt >
b.txt");. I'm noticing that no matter what kind of
redirecting/piping/whatever you want to call it I do, the redirections
don't work (at least the redirecting of the output). I can run the
same command from the command line and it works (of course).
>
Is this some kind of permissions deal? I've tried making the call to
be in places where a.txt and b.txt are in a directory that have R/W/X
permissions for PHP (I chose a directory that I actually can
successfully use the fopen et al commands with, including writing).
>
Does anyone have any ideas?
>
Thanks in advance!
>

Redirection is done by the shell, not the OS. If you want to use
redirection you either need to invoke your program through the shell or
handle the redirection yourself (much easier in C/C++ than PHP, although
still not easy).

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Jerry Stuckle
JDS Computer Training Corp.
jstucklex@attgl obal.net
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