Cannot update brew in MAC OS X el capitan and keep getting a Load error with `require`

Question

I am not sure why this is happening but I cannot update brew in my MAC OS X El Capitan. I did:

brew update

and got:

warning: unable          


        

Answer 1

You shouldn’t use sudo with Homebrew. First run the following to ensure you own everything under /usr/local:

sudo chown -R $(whoami):admin /usr/local

Alternative command for newer macOS version:

sudo chown -R $(whoami) $(brew --prefix)/*

Then reset your Homebrew repo to a clean state:

cd /usr/local && git fetch && git reset --hard origin/master

It should fix your issues.

(replace /usr/local with $(brew --prefix) if you installed Homebrew elsewhere)