Red Hat

fdisk

#!/bin/bash

BLOCKS=0

# The special /sys/ folder contains device information, not actual files.
for DEV in /sys/class/block/sd*
do
        [[ -f "$DEV/start" ]] && continue       # Skip partitions
        read B < $DEV/size                      # Read num of blocks
        read MODEL < $DEV/device/model          # Read model

        printf "%-40s%15d blocks %5d GB\n" "$MODEL" "$B" $((B/(1024*1024*2) ))
        ((BLOCKS+=B))   # Add to total
done

printf "%-40s%15d blocks %5d GB\n" "total" "$BLOCKS" $((BLOCKS/(1024*1024*2)))

 
 
[root@VM172016001140 tmp]# fdisk -l
Disk /dev/sda: 42.9 GB, 42949672960 bytes
255 heads, 63 sectors/track, 5221 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          13      104391   83  Linux
/dev/sda2              14        5222    41838617+  83  Linux