Jekyll commands

bundle exec jekyll serve  (or "jekyll serve") - start the server
bundle exec jekyll serve -w (jekyll serve -w) - start the server with watching
jekyll serve --detach - new detached server

jekyll --version - список версий
gem update jekyll

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gem outdated - устаревшие 
jekyll --version - список версий
gem update jekyll


Update all of the gems: 
gem install rubygems-update 
update_rubygems
gem update --system

or: 

gem update `gem outdated | cut -d ' ' -f 1`