작업 중 터미널을 모르고 종료시켰는데, git 명령어를 작성할 때
Another git process seems to be running in this repository, e.g.
an editor opened by 'git commit'. Please make sure all processes
are terminated then try again. If it still fails, a git process
may have crashed in this repository earlier:
remove the file manually to continue.
rm -f ./.git/index.lock
rm -rf .git
git init
git add .
git commit -m "first project commit"
git remote add origin
git push -u --force origin master
git remote update
git fetch (이거 안해도 되던데 왜 적힌걸까)
git checkout #변경
$ git branch
$ git branch -list
master
dev