The Git command git cat-file -p will print the object given as an input. Normally, it is not used in everyday Git commands, but it is quite useful to investigate how it ties the objects together.

We can also verify the output of git cat-file by rehashing it with the Git command git hash-object; for example, if we want to verify the commit object at HEAD (34acc370b4d6ae53f051255680feaefaf7f7850d), we can run the following command:

$ git cat-file -p HEAD | git hash-object -t commit --stdin
13dcada077e446d3a05ea9cdbc8ecc261a94e42d

If you see the same commit hash as HEAD pointing towards you, you can verify whether it is correct using git log -1.