Compressing export on the fly using Oracle's zip command

I am on 10.2.0.3 on HP UNIZ 11i I have been compressing my exports using pipe mechanism using gzip on UNIX. /etc/mknod $PIPE_NAME p /usr/contrib/bin/gzip < $PIPE_NAME > $BackupExportFile & exp system/$pqmsSYSTEM_PSWD file=$PIPE_NAME log=$TLOGFILE consistent=Y \ full=yes constraints=y compress=N >> $LOGFILE 2>&1