#!/bin/sh

# FriendlyFileSize.sh
# 2003-10-21
# Chieh Cheng
# http://www.CynosureX.com/

# GNU General Public License (GPL), Version 2, June 1991

# Output the file size in friendly format

scriptname=`echo $0 | sed s/\\\\/.*\\\\///g`

if [ $# -gt 1 ]
then
  echo "  Usage:   $scriptname bytes"
  exit
fi

if [ $# -eq 0 ]
then
  read size
else
  size=$1
fi

kb=1024
mb=1048576
gb=1073741824

      if [ $size -ge $kb ]
      then
        if [ $size -ge $mb ]
        then
          if [ $size -ge $gb ]
          then
            s=`expr $size / ${gb}`
            r=`expr $size % ${gb}`
            echo "${s}.${r} GB"
          else
            s=`expr $size / ${mb}`
            r=`expr $size % ${mb}`
            echo "${s}.${r} MB"
          fi
        else
          s=`expr $size / ${kb}`
          r=`expr $size % ${kb}`
          echo "${s}.${r} KB"
        fi
      else
        echo "$size" B
      fi