server operating systems

How do I find out that how many files are open and how many allowed in Linux server operating systems?

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How do I verify that the system using correct GPG keys to verify all patches, packages and update installed from RHN or repo under RHEL 5 or 6 server operating systems?

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How do I a user to the Apache group called www-data under Ubuntu or Debian Linux server operating systems?

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While updating my CentOS / RHEL HP Linux server via yum command it givens an error which read as follows:

There are unfinished transactions remaining. You might consider running yum-complete-transaction first to finish them

How do I fix this problem under RHEL / CentOS Linux 5.x server operating systems?

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