git show shows various Git objects.

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For commits:

Shows the commit message and a diff of the changes introduced.

Command	Description
git show	shows the previous commit
git show @~3	shows the 3rd-from-last commit

For trees and blobs:

Shows the tree or blob.

Command	Description
git show @~3:	shows the project root directory as it was 3 commits ago (a tree)
git show @~3:src/program.js	shows src/program.js as it was 3 commits ago (a blob)
git show @:a.txt @:b.txt	shows a.txt concatenated with b.txt from current commit

For tags:

Shows the tag message and the referenced object.