rebase and unmerged files

I tried to cleanup commit mistake and use rebase -i. It stopped and
sha1 and generated a list of unmerge files.  My intention was to use
the version in sha1 but with some editing.  Since all those unmerge
files contained unresolved conflict delineated by

<<<<<<
HEAD
=======
sha1

quoted

quoted

quoted

quoted

quoted

quoted

I have to manually type commands such as
git checkout sha1 -- file1
to get the version I wanted for further editing.  Is there any easier
method that can automating checkout all those sha1 version of the
unmerged files.

Also, for git-commit during rebase, should I use 
git commit --amend
or just
git commit

-- 
regards,
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