git回退某一个版本的某个文件

需求是有个文件需要退回到某个指定版本的状态，直接上命令 
查看帮助说明：

git checkout -h

$ git checkout -h
usage: git checkout [] 
   or: git checkout [] [] -- ...

    -q, --quiet           suppress progress reporting
    -b            create and checkout a new branch
    -B            create/reset and checkout a branch
    -l                    create reflog for new branch
    --detach              detach HEAD at named commit
    -t, --track           set upstream info for new branch
    --orphan 
                          new unparented branch
    -2, --ours            checkout our version for unmerged files
    -3, --theirs          checkout their version for unmerged files
    -f, --force           force checkout (throw away local modifications)
    -m, --merge           perform a 3-way merge with the new branch
    --overwrite-ignore    update ignored files (default)
    --conflict