if [ -d /sys/bus/scsi/devices -a \
-n "$(ls /sys/bus/scsi/devices 2>/dev/null)" ] ; then
echo 1>&2 "$PRG: /proc/scsi/scsi does not exist"
if [ -d /sys/bus/scsi/devices -a \
-n "$(ls /sys/bus/scsi/devices 2>/dev/null)" ] ; then
echo 1>&2 "$PRG: /proc/scsi/scsi does not exist"