Description:
------------
Basically, my test.php contains:

<?php

#$cmd="/usr/local/genome/gmap/gmap-2009-02-04/bin/gmap -v";
$cmd="/usr/local/genome/gmap/gmap-2009-02-04/bin/gmap -d 
oryza_sativa_rap_4 -n 1000 -k 2000 -A -B 2 sample_chlamy.fasta.valid 
>out";
system($cmd,$exeReturn);
#exec($cmd);

echo $cmd."<br/>";
echo $exeReturn."<br/>";

?>

(1) In command line, when I type "php test.php", I met success in 
executing the gmap program and get the out result.
(2) However, through the web server, the system command is always not 
executed.

I have another server that have the identical settings (such as the 
same httpd.conf, php.ini), the test.php code can be executed
through the Internet and the command line. 







Reproduce code:
---------------
<?php

#$cmd="/usr/local/genome/gmap/gmap-2009-02-04/bin/gmap -v";
$cmd="/usr/local/genome/gmap/gmap-2009-02-04/bin/gmap -d oryza_sativa_rap_4 -n 1000 -k 2000 -A -B 2 sample_chlamy.fasta.valid >out";
system($cmd,$exeReturn);
#exec($cmd);

echo $cmd."<br/>";
echo $exeReturn."<br/>";

?>