index manipulation quickref

Hi,

I'm trying to collect all operations related to index from user perspective and corresponding commands. The list may be put to git wiki if people think it can help newbies:

update file content to index: git update-index file add a file to index: git add file delete a file from index: git update-index --remove --force-remove (or remove that file in workdir and do git update-index --remove) read a tree to index: git read-tree treeish, git reset treeish read a file from a tree to index: git ls-tree treeish file|git update-index --index-info --stdin copy a file from index to workdir: git checkout-index file refresh index: git update-index --refresh copy entire index to workdir: git checkout-index output a file from index to stdout: ?? (is there a command for this?) list files in index: git ls-files compare index and workdir file listing: git ls-files (with lots of options here) diff between workdir and index: git diff diff between index and a tree: git diff --cached treeish

Am I missing any operation here?