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Combining two git repositories

Use case: You have repository A with remote location rA, and repository B (which may or may not have remote location rB). You want to do one of two things:

preserve all commits of both repositories, but replace everything from A with the contents of B, and use rA as your remote location
actually combine the two repositories, as if they are two branches that you want to merge, using rA as the remote location

NB: Check out git subtree/git submodule and this Stack Overflow question before going through the steps below. This gist is just a record of how I solved this problem on my own one day.

Before starting, make sure your local and remote repositories are up-to-date with all changes you need. The following steps use the general idea of changing the remote origin and renaming the local master branch of one of the repos in order to combine the two master branches.

Moved to git repository: https://github.com/denji/golang-tls

Generate private key (.key)

# Key considerations for algorithm "RSA" ≥ 2048-bit
openssl genrsa -out server.key 2048

# Key considerations for algorithm "ECDSA" ≥ secp384r1
# List ECDSA the supported curves (openssl ecparam -list_curves)

Remove old linux kernels

Script way

# Dry run to check
bash remove-old-kernels.sh

# Run
bash remove-old-kernels.sh exec

	-- copy.lua
	--
	-- Lua functions of varying complexity to deep copy tables.
	--


	-- 1. The Problem.
	--
	-- Here's an example to see why deep copies are useful. Let's
	-- say function f receives a table parameter t, and it wants to

	# CLI
	sudo apt update -y
	sudo apt install -y \
	git curl btop \
	docker.io docker-buildx \
	build-essential pkg-config autoconf bison rustc cargo clang \
	libssl-dev libreadline-dev zlib1g-dev libyaml-dev libreadline-dev libncurses5-dev libffi-dev libgdbm-dev libjemalloc2 \
	libvips imagemagick libmagickwand-dev mupdf mupdf-tools \
	redis-tools sqlite3 libsqlite3-0 libmysqlclient-dev \
	rbenv apache2-utils

	import numpy as np
	import soundfile as sf
	from scipy.fftpack import fft, ifft

	def rotateSignal(signal,flip):
	if flip:
	signal = signal[::-1]

	x = np.concatenate((signal, signal[1:][::-1])) # concatenating the array with a reverse of itself makes it such that the fourier transform doesn't layer over a reversed version of itself in the inverse fft
	rotSig = np.real(ifft(x))

	#!/usr/bin/env bash

	mkfifo /tmp/fifo1 /tmp/fifo2
	while read a; do echo "FIFO1: $a"; done < /tmp/fifo1 & exec 7> /tmp/fifo1
	exec 8> >(while read a; do echo "FD8: $a, to fd7"; done >&7)

	exec 3>&1
	(
	(
	(

	VERSION "BMW_E90_0.0.8"

	NS_ :
	NS_DESC_
	CM_
	BA_DEF_
	BA_
	VAL_
	CAT_DEF_
	CAT_

	/*
	In the node.js intro tutorial (http://nodejs.org/), they show a basic tcp
	server, but for some reason omit a client connecting to it. I added an
	example at the bottom.

	Save the following server in example.js:
	*/

	var net = require('net');