git 如何让单个文件回退到指定的版本

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 $ git log MainActivity.java

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commit 7641210b242a95eed17827dd8159e76bdad6d619
Author: ronanhardiman <</span>liqiang.isman@gmail.com>
Date:   Mon Apr 29 00:51:00 2013 +0800

    System.currentTimeMillis() 替代 timer 实现 连续两次返回键退出

    System.currentTimeMillis() 替代 timer 实现 连续两次返回键退出

commit a4e215234aa4927c85693dca7b68e9976948a35e
Author: kaxi4it <</span>gyj_android@sina.com>
Date:   Sat Apr 27 16:54:48 2013 +0800

    修正了退出程序的BUG

    用INT代替BOOL标记，修正了快速点击返回键一直播放退出动画的BUG，跳转页面后标记

commit d31fcc01223407492310c1567a7b84ece1287368
Author: yjl <</span>yujilong@eoemobile.com>
Date:   Mon Mar 25 12:09:21 2013 +0800

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$ git reset a4e215234aa4927c85693dca7b68e9976948a35e MainActivity.java

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Unstaged changes after reset:
M       source/src/cn/eoe/app/ui/MainActivity.java
su@SUCHANGLI /e/eoeclient/android-app/source/src/cn/eoe/app/ui (master)

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$ git commit -m "revert old file because yjl commmit have a bug"

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[master 874e01a] revert old file because yjl commmit have a bug
 1 file changed, 26 insertions(+), 19 deletions(-)
su@SUCHANGLI /e/eoeclient/android-app/source/src/cn/eoe/app/ui (master)

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$ git checkout MainActivity.java

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$ git push origin master

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Username for 'https://github.com': com360
Password for 'https://com360@github.com':
Counting objects: 17, done.
Delta compression using up to 4 threads.
Compressing objects: 100% (7/7), done.
Writing objects: 100% (9/9), 860 bytes, done.
Total 9 (delta 5), reused 0 (delta 0)
To https://github.com/com360/android-app.git
   7db7346..874e01a  master -> master
su@SUCHANGLI /e/eoeclient/android-app/source/src/cn/eoe/app/ui (master)