下記のとおりに進めたのですが、aircrackコマンドが使用できないのはなぜでしょうか、、、
$ sudo ln -s /System/Library/PrivateFrameworks/Apple80211.framework/Versions/Current/Resources/airport /usr/local/bin/airport
ln: /usr/local/bin/airport: File exists
$ aircrack-ng -1 -a 1 -b
-bash: aircrack-ng: command not found
$ brew install aircrack-ng
Warning: aircrack-ng 1.4 is already installed, it's just not linked
You can use brew link aircrack-ng to link this version.
$ brew link aircrack-ng
Linking /usr/local/Cellar/aircrack-ng/1.4...
Error: Could not symlink sbin/airbase-ng
/usr/local/sbin is not writable.