git-read-tree

Read tree into index

$ git read-tree [tree-ish]

$ git read-tree -m [base] [ours] [theirs]

$ git read-tree --prefix=[dir/] [tree-ish]

$ git read-tree --reset HEAD

git read-tree [options] tree-ish

git read-tree reads tree information into the index. It's a plumbing command used by porcelain commands like checkout and merge to manipulate the index.
The command can read single trees or perform three-way merges of trees. It updates the index without touching the working tree unless -u is specified.
git read-tree provides low-level index manipulation.

TREE-ISH

Tree to read.

Merge mode.

Update working tree.

Same as -m, discard unmerged.

Read into subdirectory.

Only update index.

Display help information.

Plumbing command. Usually invoked by other commands. Can overwrite index state.

git read-tree is a core Git plumbing command implementing index manipulation, used internally by checkout, merge, and other commands.

git-write-tree(1), git-ls-tree(1), git-checkout(1)