host1 ]$ mkdir dotfiles
host1 ]$ cd dotfiles
host1 ]$ vi .vimrc
host1 ]$ vi .bashrc

host1 ]$ vi dotfilelink.sh

#!/bin/sh


FILE=".vimrc .bashrc"
cd ~/
for i in $FILE
do
    test -f ~/${i} && cp ~/${i}  ~/${i}.`date -d '1day ago' +%Y%m%d`
    ln -s ~/dotfiles/${i} ~/${i}
done

https://github.com/

When you create a repository on GitHub, the following page will be displayed

host1 ]$ git config --global user.name "xxxxx"   # GitHub's Login Name
host1 ]$ git config --global user.email "xxxxx@users.noreply.github.com"
               # check with GitHub Page(This is important of GitHub's site icon)

host1 ]$ git config --global --list    <- check user configuration

$ git config --global credential.helper cache

$ git config --global credential.helper cache
$ ~/.git-credentials

host1 ]$ vi ~/.ssh/id_rsa_github
host1 ]$ vi ~/.ssh/config

Host github github.com
  HostName github.com
  IdentityFile ~/.ssh/id_rsa_github
  User git

$ ssh -T git@github.com
Warning: Permanently added 'github.com,xx.xx.xx.xx' (RSA) to the list of known hosts.
Hi kuritaka! You've successfully authenticated, but GitHub does not provide shell access.

host1 ]$ cd ~/dotfiles
host1 ]$ git init
host1 ]$ git add .
host1 ]$ git commit -m 'first commit'
host1 ]$ git branch -M main   #main is local repository
host1 ]$ git remote add origin https://github.com/your_name/dotfiles.git
host1 ]$ git remote -v   <- check remote repogigory
host1 ]$ git push -u origin main  #origin is remote repository, main is local repository
Username for 'https://github.com': xxxxxxx
Password for 'https://xxxxxxx@github.com':   << xxxxx Your TOKEN xxxxx>>

host1 ]$ git remote set-url origin git@github.com:[user]/[repogitory.git]
host1 ]$ git remote -v   <- check remote repogigory
host1 ]$ git push -u origin main

host1 ]$ vi xxxxx
host1 ]$ git add -A
host1 ]$ git status
host1 ]$ git commit -m "anything"
host1 ]$ git push origin main  #origin is remote repository, main is local repository

Or

host1 ]$ vi xxxxx
host1 ]$ git status
host1 ]$ git commit -a -m "anything"
host1 ]$ git push

host2 ]$ cd ~/
host2 ]$ git clone https://github.com/your_name/dotfiles
host2 ]$ ls
dotfiles
host2 ]$ sh dotfiles/dotfileslink.sh

host2 ]$ git status
host2 ]$ git pull
host2 ]$ sh dotfiles/dotfileslink.sh

Git - How to use Git.