directory/file comparing

Has anyone out there written, or know of sorce for a directory comparing algorythm? I want it to compare two folders (and their subfolders) on: - different filesize - different time/date modifed - files which are not found in the other folder When it outputs the data I want it to show two columns, listing files vertically file for file highlighting any file which is newer or bigger than its counterpart. Files which don't have a counterpart will be visiable because the other column will be blank. I could sit down for a few hours and code it but if its already out there, why bother? I release my code out to people so that they dont have to reinvent the wheel, like I often seem to do. Siggy