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What is Apache Spark?
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.
Continue reading “How To Install Apache Spark on Ubuntu”
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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.
Continue reading “Basic Bash Shell Commands – A CLI Tutorial”
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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.
Continue reading “How to Use the Screen Command in Linux”
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On September 24th, a vulnerability was reported in the GNU B
ell (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.
While Liquid Web immediately began working to proactively patch this vulnerability, some servers may remain vulnerable depending on their update settings or other unforeseen intervening factors. Thus, we’ve provided the instruction below.
Continue reading “CVE-2014-6271 and CVE-2014-7169 Info – Bash Vulnerabilities”
- This flaw exploits Bash, a Unix command-line shell run by default on most Linux servers.
- Allows for remote code execution, and many types of command-line based attacks.
- A patch is available, and your server can be easily updated.
- We have tutorials on How to Update Bash on Red Hat and CentOS and How to Update Bash on Debian and Ubuntu.
- Test the vulnerability of your server with the information below.
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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.
Continue reading “New User Tutorial: Basic Shell Commands”