问题
I am following an online resource for installing two Mac utilities
http://www.economyofeffort.com/2014/08/11/beyond-ctrl-remap-make-that-caps-lock-key-useful/
Here is the pertinent section:
Install both Karabiner and Seil. (Here again, if you use Homebrew Cask, you can do this with
$ brew cask install karabiner and
$ brew cask install seil
But the cask option is not recognized?
06:51:35/shared $brew cask install seil
Error: Unknown command: cask
Then, just for laughs I tried the command without the cask:
06:55:01/shared $brew install seil
Error: No available formula for seil
Searching formulae...
Searching taps...
Caskroom/cask/seil
It is not clear what the last line of output even means: nothing seems to have happened on the system.
I am on Yosemite.
回答1:
To use brew cask you should have it installed, this is a extension of brew, is not native.
To install it you need to run brew install caskroom/cask/brew-cask from your command line
Homebrew Cask homepage or Homebrew Cask Github
回答2:
brew tap caskroom/cask
brew install brew-cask
Now, you are ready to brew cask.
回答3:
You can also just brew install Caskroom/cask/seil. It will automatically tap the correct cask for you :)
回答4:
Install it with this command:
brew install brew-cask-completion
回答5:
One other thing to check is that it may be installed but not linked:
$ brew install caskroom/cask/brew-cask
Warning: caskroom/cask/brew-cask-0.59.0 already installed, it's just not linked
This is easily fixed by running:
$ brew link brew-cask
来源：https://stackoverflow.com/questions/30413621/homebrew-cask-option-not-recognized