This was reported in Tigerbrew, but is a worthwhile fix everywhere. Fixes mistydemeo/tigerbrew#177.
Fixes a case where brew would find commands with wrongly-capitalized user input on case-insensitive systems, then error out with a confusing message when an invalid method was sent to Homebrew. e.g.: > brew Update Error: undefined method `Update' for Homebrew:Module
Rationale: some users insist on replacing the /usr/bin/ruby symlink to point to another ruby on their system, which may break homebrew. Use the full Framework path instead, which is less likely to be tampered with. This also reorganizes the brew --config checks to reflect the different path. Fixes #12009. Closes #12333. Signed-off-by: Misty De Meo <email@example.com>