Disk space usage analysis

[Jason Dale]

Hi all ;   Does anyone know of a tool that I can use to analyse how much disk space a specific directory ( not filesystem ) is using ? in otherwords , something that can allow me to conduct an in-depth analysis of a directory tree , how much space in Mb that tree is using , how many files it has and how large those specific files are ?   I am trying to develop a solution to this problem in the form of a shell script , but this is proving painful , because the 'h' option to the ls command does not consistently use the same unit of measurement for sizing ratio reasons. Some of the files are only a few bytes in size , but there are millions of them , and so by adding up the numbers using 'expr' , I end up with a number in exponential form rather than the command being smart enough to convert the figure into a higher-level unit of measurement.   Regards , Jason