回滚到之前的版本

创建新文件“build.txt”，并提交三个版本

build 1
1
1st build.
build 2
1
2
1st build.
2nd build.
build 3
1
2
3
1st build.
2nd build.
3rd build.

查看log

$ git log
commit 027619d39bbf66daf98f4911e804908e36da3a11
Author: yongfei.hu <huyongfei@huyongfei-pc.beyondsoft.com>
Date:   Tue Nov 10 11:18:59 2015 +0800

    3rd build

commit a5a34782dbef50569a18ead65014083c95297de7
Author: yongfei.hu <huyongfei@huyongfei-pc.beyondsoft.com>
Date:   Tue Nov 10 11:18:33 2015 +0800

    2nd build

commit bed53badabb724a6b8eda2d12de6287df0e065f2
Author: yongfei.hu <huyongfei@huyongfei-pc.beyondsoft.com>
Date:   Tue Nov 10 11:18:14 2015 +0800

    1st build

回退到第2个版本（2nd build）

1 2	$ git reset --hard HEAD^ HEAD is now at a5a3478 2nd build

查看工作区文档，已经是回退到‘2nd build’。

Note: 在Git中，用HEAD表示当前版本，上一个版本就是HEAD^，上上一个版本就是HEAD^^，往上100个版本写成HEAD~100。

回滚后，恢复到最新版本

如果当前bash窗口没有关闭，找到最新版本的‘commit id’，再指定到上面即可
1
2
$ git reset --hard 027619d
HEAD is now at 027619d 3rd build

如果当前bash窗口已关闭，git reflog用来记录你的每一次命令

$ git reflog
a5a3478 HEAD@{0}: reset: moving to HEAD^
027619d HEAD@{1}: commit: 3rd build
a5a3478 HEAD@{2}: commit: 2nd build
bed53ba HEAD@{3}: commit: 1st build

再指定到相应的commit id上就好。