git copy commited files to location

# 1 commit
cp --parents `git diff-tree -r --no-commit-id --name-only --diff-filter=ACMRT $commit_id` ../output

# between commits
cp --parents `git diff-tree -r --no-commit-id --name-only --diff-filter=ACMRT $commit_id_start $commit_id_end` ../output

# reference
https://stackoverflow.com/questions/4541300/export-only-modified-and-added-files-with-folder-structure-in-git
https://stackoverflow.com/questions/29300910/how-to-send-output-of-ls-l-to-cp-command-using-pipes