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linux kernel

What Is SELinux?

What is SELinux? Why should I use SELInux on my CentOS or Red Hat Enterprise Linux server running on IBM hardware?
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How do I find out what compilers are installed under Debian / Ubuntu / Red hat Enterprise / CentOS Linux operating systems? How do I list all available compiler packages under Linux?
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I'd like to remove /dev/sdc5 temporarily without deleting partitions on hard drive /dev/sdc under Linux operating systems?
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How do I find out what the name of my CD-ROM or DVD device or Blu-ray device is under Linux operating system without using GUI options?
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I'm a home user and how do I install VirtualBox virtualization software for my home use under Debian Linux 6 operating systems?
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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 find the version of a kernel module (*.ko files located in /lib/modules/... directory) in Linux server?
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