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First, let's create the $ subl command
sudo ln -s "/Applications/Sublime Text.app/Contents/SharedSupport/bin/subl" /usr/local/bin/subl

Another option is to use duti (http://duti.org / https://github.com/moretension/duti).

Run brew install duti, save a file like this as ~/.duti:

com.sublimetext.3 public.plain-text all
com.sublimetext.3 public.unix-executable all

Then run /usr/local/bin/duti ~/.duti

# Set Sublime as Defautl for Git
git config --global core.editor "subl -n -w"