1.目录.Git

$ cd .git

   查看目录

$ ls -al
total 56
drwxr-xr-x  8 root root 4096 Apr 13 18:08 .
drwxr-xr-x  4 root root 4096 Apr 13 18:03 ..
drwxr-xr-x  2 root root 4096 Apr 13 09:51 branches
-rw-r--r--  1 root root   13 Apr 13 12:41 COMMIT_EDITMSG
-rw-r--r--  1 root root   92 Apr 13 18:01 config
-rw-r--r--  1 root root   73 Apr 13 09:51 description
-rw-r--r--  1 root root   24 Apr 13 18:03 HEAD
drwxr-xr-x  2 root root 4096 Apr 13 09:51 hooks
-rw-r--r--  1 root root  336 Apr 13 18:03 index
drwxr-xr-x  2 root root 4096 Apr 13 09:51 info
drwxr-xr-x  3 root root 4096 Apr 13 10:02 logs
drwxr-xr-x 19 root root 4096 Apr 13 12:41 objects
drwxr-xr-x  4 root root 4096 Apr 13 09:51 refs
-rw-r--r--  1 root root   15 Apr 13 18:08 test.rb

2. 查看HEAD

$ cat HEAD
ref: refs/heads/subwork

    HEAD文件中是一个引用，指向文件refs/heads/subwork（subwork是当前分支的名称）, 查看文件内容

$ cat refs/heads/subwork
ea0c3d9b9f0d328dd71205ddfc273bb1d635b507

    查看对象 “ea0c3d9b9f0d328dd”的类型。

$ git cat-file -t ea0c3d9b9f0d328dd
commit

    “ea0c3d9b9f0d328dd”是一个commit。（注：字符串不必完整复制，能够唯一标识对象即可）

    由此可见，HEAD指向了一个commit。

3.目录objects

$ cd objects

  查看目录

$ ls -al
total 76
drwxr-xr-x 19 root root 4096 Apr 13 12:41 .
drwxr-xr-x  8 root root 4096 Apr 13 18:08 ..
drwxr-xr-x  2 root root 4096 Apr 13 12:41 0c
drwxr-xr-x  2 root root 4096 Apr 13 12:10 0f
drwxr-xr-x  2 root root 4096 Apr 13 10:02 14
drwxr-xr-x  2 root root 4096 Apr 13 12:10 1e
drwxr-xr-x  2 root root 4096 Apr 13 10:39 3a
drwxr-xr-x  2 root root 4096 Apr 13 10:39 51
drwxr-xr-x  2 root root 4096 Apr 13 10:02 9c
drwxr-xr-x  2 root root 4096 Apr 13 12:10 c4
drwxr-xr-x  2 root root 4096 Apr 13 10:39 d9
drwxr-xr-x  2 root root 4096 Apr 13 10:39 e0
drwxr-xr-x  2 root root 4096 Apr 13 10:39 e6
drwxr-xr-x  2 root root 4096 Apr 13 12:41 ea
drwxr-xr-x  2 root root 4096 Apr 13 10:02 eb
drwxr-xr-x  2 root root 4096 Apr 13 12:10 f7
drwxr-xr-x  2 root root 4096 Apr 13 12:41 fb
drwxr-xr-x  2 root root 4096 Apr 13 09:51 info
drwxr-xr-x  2 root root 4096 Apr 13 09:51 pack

    进入目录3a。

$ cd 3a

    查看目录。

$ ls -al
total 12
drwxr-xr-x  2 root root 4096 Apr 13 10:39 .
drwxr-xr-x 19 root root 4096 Apr 13 12:41 ..
-r--r--r--  1 root root  122 Apr 13 10:39 d90f1713eac631f623473b59889ef820dc891f

    将目录名称“3a”和文件名称“d90f1713eac631f623473b59889ef820dc891f”组合，查看类型。

$ git cat-file -t 3ad90f1713e
tree

   查看内容。

$ git cat-file -p 3ad90f1713e
040000 tree e03c041f6c389a5ce5ff0161eba7a8ca31d23457	images
100644 blob d95f3ad14dee633a758d2e331151e950dd13e4ed	index.html
100644 blob 14c0554362cd04881158d0900f6a73055f36c396	readme.txt