git show 查看某个版本下面的文件

Enter git show, which is an awesome tool for this job. This command is quite versatile and deserves several tips on what it can do, but let’s stick to the task at hand: we want to pull a file’s contents out from a specific revision. Usually the command would be done like so:

git show <treeish>:<file>

http://gitready.com/intermediate/2009/02/27/get-a-file-from-a-specific-revision.html