Modify contents of an old commit in your branch

Before:

7 my-feature HEAD
|
6
|
5 master
|
4
|
3
|
2
|
1

Oh, commit 6 was crap:

git rebase -i HEAD~2

Mark 6 to be modified.

After:

7 my-feature HEAD
|
6v2
|
5 master
|
4
|
3
|
2
|
1

Better now, ready to push.

Note: history changes change all commits SHAs. All parents are considereEven time is considered. So is commit message/author. And obviously file contents. So now commit "7" will actually have a different SHA.

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