git-write-tree

Create a tree object from the current index

TLDR

Write tree from index

$ git write-tree

Write with prefix

$ git write-tree --prefix=[subdir/]

Missing OK

$ git write-tree --missing-ok

git write-tree creates a tree object from the current index contents and prints the resulting tree object's SHA to standard output. It is a low-level plumbing command used internally by `git commit` to snapshot the staged file structure into a tree object in the Git object database.The index must be in a fully merged state before running this command; typically `git update-index` is used first to sync the index with the working directory.