rpm command

How do I find out what is listing or using tcp port number 80 on Linux based systems using command line options?

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How do I find out php version under Linux operating systems? How do I find out php version under Unix like systems? How to find out what version of PHP is installed on my server?

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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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I‘m a new Linux system administrator and wanted to perform software installation and maintenance. I’ve downloaded a file called awstats.i386.rpm and how do I install it under CentOS / RHEL / Suse / Fedora / Redhat Linux?

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How do I find out mysql version under Linux or Unix operating systems?

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My CentOS Linux based server failed to boot with the following error:

read_urandom: /dev/urandom: open failed: No such file or directory

How do I fix this problem?

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All rpm packages can run scripts after a package is added or removed. How do I view pre/post install and uninstall rpm file scripts under rpm based Linux distributions?

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