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HowTo: Find Out MySQL Server Version Number

How do I find out mysql server version number under UNIX / Linux operating systems?
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I'm trying to login using ssh keys but server is only allows to login me using a password. The following message is logged into server /var/log/secure file:

Feb 25 06:36:50 ns5 sshd[26681]: Authentication refused: bad ownership or modes for file /home/user/.ssh/authorized_keys2

How do I fix this problem?
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