What does it mean to link/unlink something with Homebrew?
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It creates a symlink from packages installed in Cellar (regular packages installed with homebrew will already be linked).
What this also does is allow the symlinked installation from Cellar to serve as a dependency for other homebrew installations (if it's required). This is explained in another post.
Also with all homebrew commands you get a description of the formulae with the --help option (e.g.
brew link --help
).It symlinks the installed package (located in
/usr/local/Cellar
) to/usr/local
.So when you type for example:
in your terminal (ex.
$ rvm
), then the package installed via brew is run.