Git: Check if file is part of a certain commit

Question

I want to check if a certain file was part of a specified commit; if the source code at that time includes the above file. How may I achieve that?

Answer 1

git checkout <sha1 of commit> then check if file is there`

if you want to check how the file was changed in the commit then:

git diff <sha1 of commit before your commit> <sha1 of commit>

To get a full log of commits git log (you can add --oneline for brevity)