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server operating systems

Linux: Find Out Open Files [ Descriptors ] Command

How do I find out that how many files are open and how many allowed in Linux server operating systems?
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RHEL / CentOS / Fedora: Verify GPG Key For Package Update

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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Ubuntu Linux: Add a User To Group www-data ( Apache Group )

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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