How to diff directories for different files, but not line-by-line

Question

I want to see, recursively, files that are different in two directories. Diff can do this, but it shows me the line-by-line differences, which I don't want. Is there a tool that does this, or a way to do this with Diff ( I read the man page, I didn't see anything ) ?

Answer 1

What about

diff -rq DIR1 DIR2

or

diff -rqb DIR1 DIR2

-r is recursive

-q is for brief, and will just tell you if the files are different (i.e., it won't show the line-by-line differences)

-b ignores whitespace

Answer 2

If you're an emacs user, check out ediff-directories. You can see the file differences and then drill down into line-by-line differences if you need to see why they're different.

Answer 3

You're looking for the -q option:

dlamblin$ diff -r a b
diff -r a/a b/a
0a1,2
> 
> 
Only in b: b
dlamblin$ diff -qr a b
Files a/a and b/a differ
Only in b: b

Answer 4

One way to do this is to do

diff dir1 dir1| grep "diff "

It will still do a line-by-line comparison, but each file comparison begins with "diff dir1/file dir2/file", so grepping "diff " will show only those lines ( i.e. the files that are different ).