#!/bin/bash

DF=/bin/df
BLSI=${BLOCK_SIZE:-1024}
SIZE=1k-blocks
FLAG=""

while (($#>0))
do
case $1 in

 -g)
  BLSI=1073741824
  shift
  ;;

 -m)
  BLSI=1048576
  shift
  ;;

 -k)
  BLSI=1024
  shift
  ;;

 -h|-H)
  unset BLSI
  HUMAN=$1
  SIZE=Size
  shift
  ;;

 -G)
  BLSI=1000000000
  shift
  ;;

 -M)
  BLSI=1000000
  shift
  ;;

 -K)
  BLSI=1000
  shift
  ;;

 -*)
  # Don't wrap for any other switch...
  BLSI=$BLOCK_SIZE
  $DF $@
  exit
  ;;

 "")
  BLSI=${BLOCK_SIZE:-1024}
  shift
  ;;

 *)
  break
  ;;

esac
done

unset BLOCK_SIZE
case $BLSI in
  1000) SIZE=1kB-blocks ;;
  1024|1k) SIZE=1k-blocks ;;
  1000000) SIZE=1MB-blocks ;;
  1048576|1M|1024k) SIZE=1M-blocks ;;
  1000000000) SIZE=1GB-blocks ;;
  1073741824|1G|1024M|1048576k) SIZE=1G-blocks ;;
  "") true ;;
  *) SIZE=${BLSI}-blocks ;;
esac

printf "%-22s%10s%10s%10s %4s Mounted on\n" $(echo Filesystem "$SIZE" Used Available Use%)
if [ -n "$HUMAN" ]
then
  DISKFULL=$($DF -P "$HUMAN" $@ | sed -e 's^[ 	]^~^g'|tail -n +2)
  for line in $DISKFULL
  do
    printf "%-32s%10s%10s%10s %4s %s\n" $(echo $line | sed -e 's^~^ ^g' -e 's^/dev/mapper/^/dev/^' -e 's^-^/^')
  done
else
  export BLSI
  DISKFULL=$($DF -P $@ | sed -e 's^[	 ]^~^g'|tail -n +2)
  for line in $DISKFULL
  do
    NR=0
    for i in $(echo $line | sed -e 's^~^ ^g' -e 's^/dev/mapper/^/dev/^' -e 's^-^/^')
    do
      NR=$((NR+1))
      POS[$NR]=$i
    done
    s=${POS[2]}
    u=${POS[3]}
    a=${POS[4]}

    printf "%-22s%10s%10s%10s %4s %s\n" ${POS[1]} $((s*1024/BLSI)) $((u*1024/BLSI)) $((a*1024/BLSI)) ${POS[5]} ${POS[6]}
  done
fi