Merge Repos

repo_merge

# create a new repo:
git init all_projects
cd all_project
# to make it more easy to understand, let's create a new branch
git checkout -b main

# import 1st project
git remote add projectA http://projectA
git fetch --all --tags
git checkout masterA projectA/master
git rebase masterA main
# move the main branch to the current state
git branch main -f
# Now your branch main is at the same state as your A project

# import 2st project
git remote add projectB http://projectB
git fetch --all --tags
git checkout masterB projectB/master
git rebase masterB main
# move the main branch to the current state
git branch main -f
# Now your branch main contains all commits from projectA and projectB

# etc..