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‘head’: Output the first part of files

‘head’ prints the first part (10 lines by default) of each FILE; it reads from standard input if no files are given or when given a FILE of ‘-‘. Synopsis:   head [OPTION]… [FILE]… If more than one FILE is specified, ‘head’ prints a one-line header...

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Unix Admin Reference – RAID ( Redundant Array of Independent Disks )

  1.  What is RAID?   RAID is an acronym for Redundant Array of Independent Disks. A RAID system consists of an enclosure containing a number of disk volumes,    connected to each other and to one or more computers by a fast  interconnect. Six levels of RAID are...

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working with Linux runlevels

When the system boots up, it queries for the default runlevel, which is defined in  the /etc/inittab file. When that default runlevel is located, the system boots into that particular runlevel. The different runlevels are essentially “states,” which allow services to be started or stopped depending...

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