Linux script for show-total-disk-space-used

#!/bin/bash

# Usage: show-total-disk-space-used

# Shows how much local disk space is in use by the server.

function round() {

  # Returns a rounded number

  local INTEGER=$(echo $1 | cut -f1 -d.)

  [ -z "$INTEGER" ] && INTEGER=0

  local DECIMAL=$(echo $1 | cut -s -f2 -d.)

  [ -z "$DECIMAL" ] && DECIMAL=0

  [ "$DECIMAL" -gt 4 ] && INTEGER=$(($INTEGER + 1))

  echo $INTEGER

}

# Disk size used in kb, summed

KB=$(df -lkP | awk '{print $3}' | grep -v Used | awk '{sum+=$1} END{printf("%d\n",sum)}')

# Convert size to MB, GB, and TB

MB=$(round $(echo $KB/1024           | bc -l | sed -e "s/\(\.[0-9]\).*/\1/g"))

GB=$(round $(echo $KB/1024/1024      | bc -l | sed -e "s/\(\.[0-9]\).*/\1/g"))

TB=$(round $(echo $KB/1024/1024/1024 | bc -l | sed -e "s/\(\.[0-9]\).*/\1/g"))

# Use the largest human readable size to display

if [ "$TB" -gt 0 ]

then

  TOTAL_DISK_SPACE_USED="${TB}T"

elif [ "$GB" -gt 0 ]

then

  TOTAL_DISK_SPACE_USED="${GB}G"

elif [ "$MB" -gt 0 ]

then

  TOTAL_DISK_SPACE_USED="${MB}M"

else

  TOTAL_DISK_SPACE_USED="${KB}K"

fi

echo -e "$(uname -n)\t${TOTAL_DISK_SPACE_USED}"