brew-symlinks

logs-symlinks

$ brew install hadoop
Updating Homebrew...
...
...
Error: Cannot install hadoop because conflicting formulae are installed.
  yarn: because both install `yarn` binaries

Please `brew unlink yarn` before continuing.


Unlinking removes a formula's symlinks from /usr/local. You can
link the formula again after the install finishes. You can --force this
install, but the build may fail or cause obscure side effects in the
resulting software.