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Bash Shell: Check File Exists or Not

How do I test existence of a text file in bash running under Unix like operating systems?
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SSH: Agent Admitted Failure To Sign Using The Key Error And Solution

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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Faillog in Linux: Display Records of Login Failure

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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Bourne Shell Exit Status Examples

Can you explains and provide us "Bourne Shell Exit Status Code" examples?
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Linux Error: Page Allocation Failure and Solution

Q. How do I get rid of an error message that read as - "Page allocation failure"?
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Red Hat / CentOS Linux Install Cluster Suite Software

Q. How do I install Cluster Suite software on CentOS Linux 5 IBM server for testing purpose?
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