Shell script (bash) that shows the available space of the largest partition of each disk. Ignores disks without partitions.

ds

#!/bin/bash

# Example output:

# Disk: sda (894.25 GB)
#   Largest partition: sda1
#   Used space:  878 GB
#   Available space:   17 GB
# Disk: sdb (222.57 GB)
#   Largest partition: sdb2
#   Used space:  189 GB
#   Available space:   34 GB


# Get a list of all disks
DISKS=$(lsblk -dno NAME,TYPE | awk '$2=="disk"{print $1}')

# For each disk
for DISK in $DISKS; do

    # Get a list of all partitions on the disk
    PARTITIONS=$(lsblk /dev/"$DISK" -o NAME,TYPE | awk '$2=="part"{print $1}' | sed 's/[^a-zA-Z0-9]//g')

    # Initialize the maximum size and corresponding partition to be empty
    MAX_SIZE=0
    MAX_PARTITION=""
    
    # For each partition
    for PARTITION in $PARTITIONS; do
        # Get the size of the partition in GB
        SIZE=$(lsblk /dev/"$PARTITION" -o SIZE -b --output=SIZE | tail -n1 | awk '{ printf "%.2f", $1/1024/1024/1024 }')
        
        # If this is the largest partition we've seen so far
        if (( $(echo "$SIZE > $MAX_SIZE" | bc -l) )); then
            # Update the maximum size and partition
            MAX_SIZE=$SIZE
            MAX_PARTITION=$PARTITION
        fi
    done
    
    # If a partition was found on the disk
    if [ "$MAX_PARTITION" != "" ]; then
        # Get the used and available space on the partition in GB
        USED_SPACE=$(df -BG --output=used /dev/"$MAX_PARTITION" | tail -n1 | sed 's/G//')
        AVAIL_SPACE=$(df -BG --output=avail /dev/"$MAX_PARTITION" | tail -n1 | sed 's/G//')
        FULL_CAPACITY="$(lsblk /dev/"$DISK" -o SIZE -b --output=SIZE | tail -n1 | awk '{ printf "%.2f GB", $1/1024/1024/1024 }')"
 
        # Print the disk and partition information
        echo -e "Disk: $DISK (\033[1m$FULL_CAPACITY\033[0m)"
        echo "  Largest partition: $MAX_PARTITION"
        echo "  Used space: $USED_SPACE GB"
        echo -e "  \033[1mAvailable space: $AVAIL_SPACE GB\033[0m"
    fi
done