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

Note: Only do the below if you end up in a completely failed state, as this is very DANGEROUS

As an example I kept getting

$ sudo ln -s Current 1.8

$ brew update

/usr/local/Library/brew.rb:18:in ': undefined method help?’ for [“update”]:Array (NoMethodError)

I just get this…(no matter what command just switch out “update” with the command) I solved the problem by asking for a buddies /usr/local folder. I then made a backup of my /usr/local folder.

sudo mv /usr/local /usr/local.orig

I then moved his /usr/local to mine

sudo mv ~/Downloads/local /usr/local

Note: You will likely lose some data so make sure to make a backup.