1.用git rev-list HEAD取得版本號列表：
在SmartGit中看到的也是這樣，驗證了我們的猜想：
取到兩個版本號之后，用git diff命令：git diff [--options] <commit>...<commit> [--] [<path>…]
這里的[-options]我們填的是--name-status，<commit>指的是版本號，也就是每次版本的散列值，可以填前幾位就可以了，git會自動識別。
--name-status選項，可以輸出每個修改的文件的狀態，添加，修改，刪除還是重命名等。
輸入命令git diff --help可以查看幫助文檔：
--name-status
Show only names and status of changed files. See the description of the --diff-filter option on what the status letters mean.
--diff-filter=[(A|C|D|M|R|T|U|X|B)…[*]] Select only files that are Added (A), Copied (C), Deleted (D), Modified (M), Renamed (R), have their type (i.e. regular file, symlink, submodule, …) changed (T), are Unmerged (U), are Unknown (X), or have had their pairing Broken (B). Any combination of the filter characters (including none) can be used. When * (All-or-none) is added to the combination, all paths are selected if there is any file that matches other criteria in the comparison; if there is no file that matches other criteria, nothing is selected. Also, these upper-case letters can be downcased to exclude. E.g. --diff-filter=ad excludes added and deleted paths.
其中M和1.txt之間是\t，后面的是目錄和文件，如果是在ubuntu下的話，比如修改了文件夾aa下的my.txt
則：
M\taa/my.txt
因為linux上的文件夾目錄都是/，windows的，沒有測試有需要的可以測試。
如何要輸出到文件中：
// >> 后加輸出文件的路徑、文件名和后綴名 git diff [branchA] [branchB] >>d:/diff/exportname.diff
linux的重定向命令 覆蓋 git diff [branchA] [branchB] > a.txt 追加 git diff [branchA] [branchB] >> a.txt
參考：https://segmentfault.com/q/1010000005033288
命令的具體參考幫助文檔：git diff --help
用git show命令也可以：
git show會在下面包含每個文件的對比信息（內容），這將會是大量字符串。
具體如果有目錄下的文件不能顯示區別，則兩個命令的差異實踐幾次就會發現，可以解決問題的。