为了忘记私钥密码（id_rsa），我通常运行：
ssh-add -D # to forget all loaded identities
ssh-add -d # to forget primary identity ($HOME/.ssh/id_rsa)
现在使用 macOS Sierra v10.12.1 我收到这个错误：
$ ssh-add -D
All identities removed.
$ ssh-add -d
Could not remove identity "/Users/user/.ssh/id_rsa": agent refused operation
Could not remove identity "/Users/user/.ssh/id_dsa": agent refused operation
我搜索谷歌没有运气！