php exec()

hi all, this is the first time i try out the mailing list. i hope to get help from here. thank you. i hope this email can reach the mail group as i use bluecolour.sz to sign on the news group but using bluecolour to do all the emailing. i am facing a problem when i study exec() php function: i tried the example 1 on http://cn.php.net/manual/en/function.exec.php <?php // outputs the username that owns the running php/httpd process // (on a system with the "whoami" executable in the path) echo exec('whoami'); ?> this is alright for me. when i added a line to the script <?php // outputs the username that owns the running php/httpd process // (on a system with the "whoami" executable in the path) echo exec('whoami'); echo exec('/program/ipkg-0.99.163/bin/ipkg-cl --version'); [echo exec('ifconfig');] ?> the output from the browser is the same and not the expecting version of the ipkg-cl. then i tried to echo exec('ifconfig'); the output is the same also. below is the output of server error log. root [ /srv/www/test ]# !tail tail /program/httpd-2.2.9/logs/error_log [Mon Nov 03 11:25:14 2008] [error] [client 10.104.9.220] ipkg version 0.99.163 ------------------------- ipkg-cl is executable. is chmod 777. root [ /srv/www/test ]# file /program/ipkg-0.99.163/bin/ipkg-cl /program/ipkg-0.99.163/bin/ipkg-cl: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), for GNU/Linux 2.6.0, dynamically linked (uses shared libs), not stripped i have tried to read more on the php net and have a few different trials. i do not have more idea now, i hope i can get someone help from here. thank you. regards,-keo