failure

How do I test existence of a text file in bash running under Unix like operating systems?

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I‘ve recently regenrated and uploaded a new public ssh-key using the ssh-copy-id command. Now I’m getting the following error:

ssh root@server3
Agent admitted failure to sign using the key.
root@server3’s password:

How do I fix this problem?

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I‘m running RHEL on HP server. This server allows to login to reset of the LAN from the Internet. How do I find out failed login records under Linux operating systems?

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Can you explains and provide us “Bourne Shell Exit Status Code” examples?

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Q. How do I get rid of an error message that read as – “Page allocation failure”?

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