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dmesg command

How do I find out my SATA link speed? How do I make sure my sata hard disk is working at 6Gbps speed and how do I verify this on a Linux server running on HP or IBM amd64 hardware?
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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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grep Command Tutorial For Ubuntu / Debian Linux

I recently switched from MS-Windows XP to Ubuntu Linux. How do I use the grep command on Ubuntu or Debian Linux? Can you give us some practical examples?
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Linux Create A Bootable USB Pen

How do I create a bootable USB pen drive to start my CentOS / Fedora Linux? How do I create a bootable USB flash pen for installation of Linux, and for creation of rescue and other special-purpose boot disks using command line options?
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Ubuntu Linux: View Boot Log

How do I view detailed boot log of my Ubuntu system?
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FreeBSD Check The Health of Adaptec RAID Array

I've Adaptec RAID 1 set via 5405 PCI card. I know how to get check the health of Adaptec RAID array under Linux, but how do I find information about my RAID card, RAID status, disk failure and other information via command line?
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How do I mount the CDROM from FreeBSD shell or command line?
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