If you save a lot of textfiles, e.g. you store historical versions of webpages, you do not want to store empty files or duplicate files.
Housekeeping can be done that way:
1. find empty files
find $PATH -type f -empty
if you want to delete them:
find $PATH -type d -empty -delete
2. find duplicate files
fdupes -r $PATH
In order to delete the duplicate files:
fdupes -rdN $PATH r - recursive d - preserver first file, delete other dupes N - run silently (no prompt)
That will result in a reduced number of files and in a reduced number of duplicate content.