How to get Ruby / Homebrew / RVM to work on Yosemite?

Question

After installing Yosemite, I was unable to run brew or ruby.

I was getting this error on brew update:

/usr/local/bin/brew: /usr/local/Library/brew.r         


        

Answer 1

This error can easily be fixed in the following steps:

1) Open terminal

2) Type nano /usr/local/Library/brew.rb

3) In the first line change “1.8″ to “Current”, so it should look like this:

#!/System/Library/Frameworks/Ruby.framework/Versions/Current/usr/bin/ruby -W0

via http://blog.ic3man.gr/2014/06/homebrew-ruby-bad-interpreter-no-such-file-or-directory/