Turn off generating css.sass and js.coffee files

config.generators.stylesheets = false
config.generators.javascripts = false

in application.rb

Install Ruby 2.0 Preview 1 on Mac OS

$ brew install libyaml
$ rvm install ruby-2.0.0-preview1 --with-openssl-dir=$HOME/.rvm/usr --verify-downloads 1

Install a specific version of gems from a list of gems in a file

cat gems.txt | while read x; do rvm use @@global && gem install $x -v=2.3.8 ; done

find current time mysql

SELECT CURTIME();