You can't, that would default the whole point of git's sha1 hashes!

If you change a commit, you will change the sha1 hash of that commit,  
and every subsequent commit. There is no way around it.

Quoting bill lam <cbill.lam@gmail.com>:

quoted text
> I made some typos in commit messages, how to edit them without
> affecting everything else?
>
> Thanks in advance.
>
> --
> regards,
> ====================================================
> GPG key 1024D/4434BAB3 2008-08-24
> gpg --keyserver subkeys.pgp.net --recv-keys 4434BAB3
> 唐詩311 無名氏  雜詩
>     盡寒食雨草萋萋  著麥苗風柳映堤  等是有家歸未得  杜鵑休向耳邊啼
> --
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