I am not looking for one answer, I am looking for knowledge to perform the task if managing disk space for Linux .
Pretty much our disk space is managed with little spare space anywhere.
I would like to know:
1) what files are new ( with in the last month, 2 months etc ) on a partition such as /app
2) how to find the disk space taken up by each directory. Here is the catch, usually the disk space reported includes the subdirectorys. An empty directory can report any size depending on what the subdirectories are and I only want to know want to know the disk space taken up only by the files in that directory.
3) what kinds of files can normally be deleted in Linux. I already know old rpm files are kept in an directory.
4) Other secrets of the disk management game :)