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Some ssh tricks

1 ssh log on without password
1) in localhost, ssh-key-gen
2) in localhost, ssh-copy_id username@remotehost

2 remove entries from known_hosts
you may get the error like the following message, if remotehost change it's ip address:
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
...
Add correct host key in /home/username/.ssh/known_hosts to get rid of this message.
Offending key in /home/username/.ssh/known_hosts:$line_number$
...

To solve this, you may
1) edit ~/.ssh/known_hosts
2) remove line $line_number$
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