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[root@localhost helloworld-git]# echo "helloworld" >helloworld.txt [root@localhost helloworld-git]# git add helloworld.txt [root@localhost helloworld-git]# git commit -m 'helloworld-master' [master (root-commit) fddae22] helloworld-master  Committer: root <root@localhost.localdomain> Your name and email address were configured automatically based on your username and hostname. Please check that they are accurate. You can suppress this message by setting them explicitly:     git config --global user.name "Your Name"     git config --global user.email you@example.com After doing this, you may fix the identity used for this commit with:     git commit --amend --reset-author  1 file changed, 1 insertion(+)  create mode 100644 helloworld.txt [root@localhost helloworld-git]# git log commit fddae22359221092ade97421800f308f0d8e3886 Author: root <root@localhost.localdomain> Date:   Thu Mar 21 16:50:51 2013 +0800     helloworld-master [root@localhost helloworld-git]# echo "world hello">helloworld.txt [root@localhost helloworld-git]# cat helloworld.txt world hello [root@localhost helloworld-git]# git checkout helloworld.txt [root@localhost helloworld-git]# cat helloworld.txt helloworld [root@localhost helloworld-git]# 

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