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Suppose the file with full path path/to/file has been deleted in a previous commit and we want it back
First we search for the last commit referring to the file
git rev-list -n 1 HEAD -- path/to/file
Then will return the hash code (say <hash_code_commit>) of the last commit referring to the file. It is the commit that has deleted the file. So we need to get it from the commit before using ^
git checkout <hash_code_commit>^ -- path/to/file
This will restore the last version of the file at its original path.