boot2docker ipの出力に余計なメッセージが出る
$ boot2docker ip
The VM's Host only interface IP address is: 192.168.59.103
以下のようにするとIP部分だけ取れる.
echo $(boot2docker ip 2>/dev/null)
けど1.3.3(boot2docker cliのバージョン)以降は余分なメッセージは出なくなるらしい。
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