OK I'm getting closer.... /usr/local/bin/gphoto2: /usr/local/bin/gphoto2: cannot execute binary file Using command within CGI as follows: system("sudo -i -u www-data gphoto2 --set-config capture=on --set-config capturetarget=1 --set-config capture=on --set-config eos-shutterspeed=".$code." --set-config capture=on --set-config eos-iso=".$icode." --set-config capture=off --capture-image"); Any idea's what I've done wrong now....