Another command I want to write down, like dot_clean, so that I remember the details:
diff – Compare files line by line.
Usage: diff [OPTION]… FILES
FILES are `FILE1 FILE2′ or `DIR1 DIR2′ or `DIR FILE…’ or `FILE… DIR’.
diff -rq folder1 folder2
e.g. -r (rekursive) and -q (brief output)
diff -rq /Users/memm/Backup/Documents/ /Volumes/Documents/