github-backup.sh

#!/bin/bash
#
# Create list.txt with each repo name on a new line
#
# You can copy all the names from your GitHub repo page with the following command in the browser
#   copy([ ...document.querySelectorAll("a[itemprop]")].map(a=>a.href.match(/.*\/(.*)$/)[1]).join("\n") + "\n")
#
# Or open settings, repositories, and copy the names from the list, this method below includes repos which you collaborate with, so you may need to just manually remove them
#   copy([...document.querySelectorAll(".js-collaborated-repos a.mr-1")].map(n=>n.innerText.replace(/^.*\//,'')).join("\n"))
# Then run:
#   bash github-backup.sh USERNAME
#
# Tip, if using PuTTY, you can convert key to OpenSSH format, then first use:
#   eval `ssh-agent`
#   ssh-add /path/to/key
#
# When using WSL, it may help to configure /etc/wsl.conf
#   [automount]
#   options = "metadata"
#

USERNAME=$1

if [[ $USERNAME = "" ]]; then
	echo "Usage: backup.sh USERNAME"
    exit 1
fi

while IFS= read -r repo
do
	repo_url="git@github.com:${USERNAME}/${repo}"
	if [ -d "$repo" ]; then
		echo "Updating ${repo}"
		cd "$repo"
		git pull
		cd ..
	else
		echo "Cloning ${repo}"
		git clone "$repo_url"
	fi
done < list.txt