know_hosts登録の確認方法
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						$ ssh-keygen -F xxx.xxx.xxx.xxx  | 
					
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						# Host xxx.xxx.xxx.xxx found: line 5 type RSA xxx.xxx.xxx.xxx ssh-rsa AAA6OhgkZa0L6XDnmHE0NaBprr0VHhSjQ4bEtj j/hVXLSQqMBkigKGI7AbcgAB3NzaC1yc2EAAAADAQABAAABAQC2ytDRUlU4fZB 6OmcwJuhaiZElYEYcDy7p1/MR5wqRPhk5T34yQrVlsb2utNWRHRTwG50kbrAkK  | 
					
known_hosts登録からの削除方法
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					 1  | 
						$ ssh-keygen -R xxx.xxx.xxx.xxx  | 
					
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						# Host xxx.xxx.xxx.xxx found: line 5 type RSA /Users/Ichiro/.ssh/known_hosts updated. Original contents retained as /Users/Ichiro/.ssh/known_hosts.old  |