Unix, Linux, DevOps , Cloud computing and BigData Knowledge-Base

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‘base64’: Transform data into printable data

‘base64’ transforms data read from a file, or standard input, into (or from) base64 encoded form.  The base64 encoded form uses printable ASCII characters to represent binary data.  Synopses:      base64 [OPTION]… [FILE]      base64 –decode [OPTION]… [FILE] The base64 encoding expands data to roughly 133%...

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‘nl’: Number lines and write files – Linux Command

‘nl’ writes each FILE (‘-‘ means standard input), or standard input if none are given, to standard output, with line numbers added to some or all of the lines. Synopsis: nl [OPTION]… [FILE]… ‘nl’ decomposes its input into (logical) pages; by default, the line number is...

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5 Commands to view Linux File Content

  cat   Command::               Concatenate and write files tac Command ::                Concatenate and write files in reverse nl Command ::                   Number lines and write files od Command ::                  Write files in octal or other formats base64 Command ::         Transform data into printable data...

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Mastering GrUB – Part 3 – Grub Booting and Images

Booting GRUB from the network The following instructions don’t work for *-emu, i386-qemu,i386-coreboot, i386-multiboot,mips_loongson, mips-arc and mips_qemu_mips to generate a netbootable directory, run:       grub2-mknetdir –net-directory=/srv/tftp –subdir=/boot/grub -d /usr/lib/grub/<platform> E.g.  for i386-pc:     grub2-mknetdir –net-directory=/srv/tftp –subdir=/boot/grub -d /usr/lib/grub/i386-pc Then follow instructions printed out by grub2-mknetdir on...

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Mastering Grub – Part 1 – Introduction and Overview of Grub Boot Loader

1. Introduction to Grub Briefly, a “boot loader” is the first software program that runs when a computer starts. It is responsible for loading and transferring control to an operating system “kernel” software (such as Linux or GNU Mach). The kernel, in turn, initializes the rest...

VCS information Center

  VCS for Beginners Read – VCS for Beginners – Getting Started with VCS Read – VCS for Beginners– Cluster Membership & IO Fencing Read – VCS for Beginners – Understand Jeopardy Condition with real time scenerio Read – VCS for Beginners – Configuring Veritas Cluster...

VxVM Information Center

VxVM Beginners Learning Read – VxVM Beginner’s Lesson Read – VxVM Learning with Commands and Examples Read – What is new in VxSF 6.0 Read – Important Definitions of VxVM Read – VxVM Volume States and Plex States Read – Veritas Plex state Transition VxVM How-to...

Storage Configuration information Center

  Read – SAN Guide for Beginners Read – SAN Storage Responsibilities for Enterprise System Administrators Read – Pre-Planning/Pre-work required for Storage Migrations in Unix. Read – SCSI Guide for Beginners Read – EMC Power Path commands for system administrators Read – Determine WWN for HBA...

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