About

git show ¹⁾ is a general command line tool that shows information about object

Basically

git show hash

where hash is the object hash

• for commits it shows the log message and textual diff. It also presents the merge commit in a special format as produced by git diff-tree –cc.
• for tags, it shows the tag message and the referenced objects.
• for trees, it shows the names (equivalent to git ls-tree with –name-only).
• for plain blobs, it shows the plain contents.