命令选项

git cat-file Provide content or type and size information for repository objects.

git cat-file 命令显示版本库对象的内容、类型及大小信息。

object

The name of the object to show. For a more complete list of ways to spell object names, see the “SPECIFYING REVISIONS” section in gitrevisions(7).

-t Instead of the content, show the object type identified by object. 显示对象的类型。

-s Instead of the content, show the object size identified by object. 显示对象的大小。

-e Suppress all output; instead exit with zero status if object exists and is a valid object. 如果对象存在且有效，命令结束状态返回值为 0 。

-p

Pretty-print the contents of object based on its type. 根据对象的类型，以优雅的方式显式对象内容。

type Typically this matches the real type of object but asking for a type that can trivially be dereferenced from the given object is also permitted. An example is to ask for a “tree” with object being a commit object that contains it, or to ask for a “blob” with object being a tag object that points at it.

用法示例

sha1sum 命令生成字符串 “Git” 的哈稀值：

printf Git | sha1sum

生成 HEAD 对象的哈稀值：

(printf "%s %d\000" `git cat-file -t HEAD` `git cat-file -s HEAD`; git cat-file -p HEAD) | sha1sum

参考

git-cat-file gitrevisions