Moving a directory from one repo to another

commands.sh

git clone <repourl>/repo-1.git 
git clone <repourl>/repo-2.git

# Start in the source repo
cd repo-1
git remote rm origin # delete link to original repository to avoid any accidental remote changes
git filter-branch --subdirectory-filter dir-to-move -- --all  # dir-to-move is being moved to another repo.  This command goes through history and files, removing anything that is not in the folder.  The content of this folder will be moved to root of the repo as a result. 
# This folder has to be moved to another folder in the target repo.  So, move everything to another folder.
git filter-branch --index-filter \
  'git ls-files -s | sed "s-\t\"*-&NEWSUBDIR/-" |
   GIT_INDEX_FILE=$GIT_INDEX_FILE.new \
   git update-index --index-info &&
   mv "$GIT_INDEX_FILE.new" "$GIT_INDEX_FILE"' HEAD

# Now switch to target repo and fetch everything from source.
git clone repo-2
git remote add master ../repo-1/
git pull master master --allow-unrelated-histories # --allow-unrelated-histories may not be known by old versions of git
git push  # push everything to remote