anyone got a good comparison program?

[lotsofplants]

So, I was curious. Anyone know of a program which can compare computer files to see if they are identical? I'm looking for ones that do the following comparisons:

-- will locate files with identical date/time/name but different locations
-- will find files which have identical date/time but different names
-- can compare two files to see if their contents are identical, even if the names or date/time are different.

I'm betting that the first is fairly easy, the last hardest. Suggestions, preferably for things which are cheap or free?

Comments

[boojum.livejournal.com]

If you have access to a Unix box, the last is dead easy (diff will work on both text and binary files, no problem). If you're on Windows, CygWin may give you that functionality.

diff --brief one_file the_other_file

will tell you if they're different without telling you all the details of how.