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Linux / UNIX: For Loop To Remove Files

How do I use a for loop in Unix to remove files?
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Tar Extract a Single File(s) From a Large Tarball

Q. I've couple of large tarballs such as www.tar and images.tar. Is it possible to extract a single file or a list of files from a large tarball such as images.tar instead of extracting the entire tarball? How do I extract specific files under Linux / UNIX operating systems?
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Q. I know how to find out current running kernel version under CentOS Enterprise Linux 4.6 x86_64, but how do I find out latest available kernel version? How do I find out if it's the latest one? How to find the latest release version for package called xyz or kernel package?
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