e.g.

username = ihuixu

1.new folder.

mkdir ihuixu.github.io
cd ihuixu.github.io

2.new jekyll program.

sudo gem install jekyll bundler
jekyll new .

3.git push

git init
git commit -m "first commit"
git remote add origin https://github.com/ihuixu/ihuixu.github.io.git
git push -u origin master

ps

1.How to start server in local.

bundle install
bundle exec jekyll serve

2.How to change the theme of the site.

vi Gemfile

gem 'themename'

vi _config.yml

theme: themename

3.You may check the ruby’s version, and install bundler again.

ruby -v
rvm install ruby-2.2.2
gem install jekyll bundler
bundle install