git cat-file

Provide content or type and size information for Git repository objects. More information: https://git-scm.com/docs/git-cat-file.

• Get the [s]ize of the HEAD commit in bytes:
  git cat-file -s HEAD
• Get the [t]ype (blob, tree, commit, tag) of a given Git object:
  git cat-file -t {{8c442dc3}}
• Pretty-[p]rint the contents of a given Git object based on its type:
  git cat-file -p {{HEAD~2}}