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git subtree origin desc and manul

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git subtree is powerful, but it document is not easy find by search engine. if search git subtree you got many article but not the origin doc.

so may be search by: git subtree txt

here is core desc of git subtree documentaion:

git split​

 	Extract a new, synthetic project history from the
	history of the <prefix> subtree of <local-commit>, or of
	HEAD if no <local-commit> is given.  The new history
	includes only the commits (including merges) that
	affected <prefix>, and each of those commits now has the
	contents of <prefix> at the root of the project instead
	of in a subdirectory.  Thus, the newly created history
	is suitable for export as a separate git repository.

so git subtree core​

 # split all commit relative with in /subdir into a new branch "tmpbranch"
 git subtree split --prefix subdir -b tmpbranch
 # push this branch to new repo
 git push git@github.com/xxx/newrepo tmpbranch:main

one shortcut cmd do same of above​

git subtree push --prefix subdir  git@github.com/xxx/newrepo main