Don't use exponent math in POSIX sh

scsictl

@@ -22,13 +22,13 @@ case "${1}" in
     echo "${BLK_INFO}" | while read -r BLOCKDEV DEV_PORT DEV_HCIL; do
       DEVICE_ID="$(ls -l --color=never /dev/disk/by-id | sed 's/  \+/ /g' | grep -v 'nvme-eui\|wwn-' | grep "${BLOCKDEV}$" | cut -d\  -f9)"
       DEV_BYTES="$(lsblk -bnPo NAME,SIZE | grep "\"${BLOCKDEV}\"" | cut -d\" -f 4)"
-      if [ "${DEV_BYTES}" -ge $((1000**5)) ]; then
+      if [ "${DEV_BYTES}" -ge $((1000000000000000)) ]; then
         DEVICE_SZ="$(awk "BEGIN {print ${DEV_BYTES}/1000^5}" | cut -b1-5)T"
-      elif [ "${DEV_BYTES}" -ge $((1000**4)) ]; then
+      elif [ "${DEV_BYTES}" -ge $((1000000000000)) ]; then
         DEVICE_SZ="$(awk "BEGIN {print ${DEV_BYTES}/1000^4}" | cut -b1-5)T"
-      elif [ "${DEV_BYTES}" -ge $((1000**3)) ]; then
+      elif [ "${DEV_BYTES}" -ge $((1000000000)) ]; then
         DEVICE_SZ="$(awk "BEGIN {print ${DEV_BYTES}/1000^3}" | cut -b1-5)G"
-      elif [ "${DEV_BYTES}" -ge $((1000**2)) ]; then
+      elif [ "${DEV_BYTES}" -ge $((1000000)) ]; then
         DEVICE_SZ="$(awk "BEGIN {print ${DEV_BYTES}/1000^2}" | cut -b1-5)M"
       elif [ "${DEV_BYTES}" -ge 1000 ]; then
         DEVICE_SZ="$(awk "BEGIN {print ${DEV_BYTES}/1000}" | cut -b1-5)K"