git diff два commits один файл
$ git diff HEAD^^ HEAD main.c
$ # show diff between HEAD(current commit) and HEAD^^(two commits back) for main.c
Difficult Dog
$ git diff HEAD^^ HEAD main.c
$ # show diff between HEAD(current commit) and HEAD^^(two commits back) for main.c
git diff <branch_hash> <other_branch_hash> -- <file_path>