#!/bin/bash

# newdf - a friendlier version of df

sedscript="/home/newdf.$$"

trap "rm -f $sedscript" EXIT

cat << 'EOF' > $sedscript
function showunit(size)
{ mb = size /1024; prettymb=(int(mb * 100)) / 100;
  gb =mb / 1024; prettygb=(int(gb * 100)) /100;

if (substr(size,1,1) !~ "[0-9]" ||
    substr(size,2,1) !~ "[0-9]" ) {return size }
else if (mb < 1) { return size "K" }
else if (gb < 1) { return prettymb "M" }
else             { return prettygb "G" }
}

BEGIN {
  printf "%-27s %7s %7s %8s %-s\n",
       "Filesystem", "Size", "Used", "Avail", "Capacity", "Mounted"
}

!/Filesystem/ {

   size=showunit($2);
   used=showunit($3);
   avail=showunit($4);

   printf "%-27s %7s %7s %8s %-s\n",
         $1, size, used, avail, $5, $6
}
EOF

df -k | awk -f $sedscript

exit 0