Tag: Shell

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What is Apache Spark?

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Apache Spark is a distributed open-source, general-purpose framework for clustered computing. It is designed with computational speed in mind, from machine learning to stream processing to complex SQL queries. It can easily process and distribute work on large datasets across multiple computers.

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What is Bash?

Bash, or the Bourne Again SHell, is based on the Bourne shell. It is the default shell command language interpreter for GNU Linux/Unix and is accessed via a terminal. The shell was the original method for interacting with the operating system before GUIs were implemented. It has the ability to execute single commands, understand regular expressions, as well as scripts written in the bash language. It is currently the default interactive shell on most all modern Linux distributions.

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What is Screen?

Screen is a terminal program in Linux which allows us to use a virtual (VT100 terminal) as full-screen window manager which multiplexes an open physical terminal between multiple processes, which are typically, interactive shells. It allows us to access multiple terminal sessions within a single terminal or a remote terminal session. It is most useful when addressing multiple Linux shell commands on the command line, as well as separating commands from the shell that started the commands.

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Note:
Please note that this article is considered legacy documentation because Fedora 20 and 21 has reached its end-of-life support.
Pre-Flight Check
  • These instructions are intended specifically for updating Bash on Fedora 20 and Fedora 21.
  • I’ll be working from both a Liquid Web Self Managed Fedora 20 server and a Liquid Web Self Managed Fedora 21 server, and I’ll be logged in as root.

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On September 24th, a vulnerability was reported in the GNU Bourne-Again-Shell (BASh, or Bash), specifically a flaw with how Bash processes values of environment variables, that allows remote code execution of varying types in many common configurations. The overall risk is severe due to bash being configured for use, by default, on most Linux servers.

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Pre-Flight Check
  • These instructions are intended specifically for updating Bash on Red Hat and CentOS.
  • I’ll be working from both a Liquid Web Core Managed CentOS 6 server and a Liquid Web Self Managed CentOS 7 server, and I’ll be logged in as root.

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Pre-Flight Check
  • These instructions are intended specifically for updating Bash on Debian and Ubuntu.
  • I’ll be working from both a Liquid Web Core Managed Ubuntu 14.04 server and a Liquid Web Self Managed Debian 7.4 server, and I’ll be logged in as root.

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Pre-Flight Check
  • These instructions are intended specifically for updating Bash on CentOS 6 and CentOS 7.
  • I’ll be working from both a Liquid Web Core Managed CentOS 6 server and a Liquid Web Self Managed CentOS 7 server, and I’ll be logged in as root.

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Now that you know how to SSH into your server it is important to familiarize yourself with some basic command line tools.

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