Diffing between two entire directories/projects in hg or git?

Question

I inherited a project originally stored in CVS with all the revisions. I made quite a few edits, and I\'m trying to compare all the changes I made in the original directory,

Answer 1

To simply create a diff patch in git's diff format from two arbitrary files or directories, without any fancy repository stuff or version control:

git diff --no-index some/path other/path > some_filename

Jakub Narębski's comment on knittl's answer hinted at the answer... For simplicity's sake, that's the full command.

The > part creates a file and redirects the output to it. If you don't want a file and just want the output printed in your console so you can copy it, just remove the > some_filename part.

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For convenient copying and pasting, if you've already cded to a directory containing the original directory/file named a and the modified directory b, it'll be:

git diff --no-index a b > patch