Git export import commits history

Question

we have one big git repo, which includes 3 folders for different projects:

Existing repo consists of - .net_newrepo, java_newrepo, android_newrepo

New project should contain history only about particular project. .net about .net, and not about ios and android etc.

Answer 1

This should work

$ cd dotnet_newrepo
$ git filter-branch --subdirectory-filter dotnet_is_dir -- --all
$ cd ..
$ cd java_newrepo
$ git filter-branch --subdirectory-filter java_is_dir -- --all
$ cd ..
$ cd android_newrepo
$ git filter-branch --subdirectory-filter android_is_dir -- --all
$ cd ..