How can I move a directory in a Git repo for all commits?

You can use the subdirectory filter to achieve this

 $ git filter-branch --subdirectory-filter blog/ -- --all

EDIT 1: If you don’t want to effectively make _posts the root, use a tree-filter instead:

 $ git filter-branch --tree-filter 'mv blog/_posts .' HEAD

EDIT 2: If blog/_posts did not exist in some of the commits, the above will fail. Use this instead:

 $ git filter-branch --tree-filter 'test -d blog/_posts && mv blog/_posts . || echo "Nothing to do"' HEAD

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