open() function in perl doesn't return anything to

[reet]

hi there,
i used an open() function in perl to read the ouput of a pipeline to filehandle. the script is:
open(AVR,"cd ~/avrora1/avrora/bin java avrora.Main ~/perlp/check/od |");
But nothing is passed to AVR.
I am so confused. Can anyone help?

thanks