Answers for "push project to github command line"

git push existing repo

cd existing_folder
git init
git remote add origin https://gitlab.com/abc.git
git add .
git commit -m "Initial commit"
git push -u origin master

push code to github command line

git add .
git commit -m "message for the commit"
git remote add origin https://url-of-github-repo
git push origin master