ShellCheck is a static analysis tool for shell scripts. One can use it to finds bugs in your shell scripts. It is written in Haskell. You can find warnings and suggestions for bash/sh shell scripts with this tool. Let us see how to install and use ShellCheck on a Linux or Unix-like system to enhance your shell scripts, avoid errors and productivity.

All Systems Go! is an open source community conference focused on the projects and technologies at the foundation of all modern Linux systems, specifically, low-level user-space technologies. Its goal is to provide a friendly and collaborative gathering place for individuals and communities working to push these technologies forward.

All Systems Go! is a 2-day event with 2 talks happening in parallel. Full presentation slots are 30-45 minutes in length and lightning talk slots are 5-10 minutes.

• Liberating. The Guix System Distribution (GuixSD) is an advanced distribution of the GNU operating system developed by the GNU Project—which respects the freedom of computer users.
• Dependable. It comes with the GNU Guix package manager, which in addition to standard package management features, supports transactional upgrades and roll-backs, unprivileged package management, per-user profiles, and more.
• Hackable. It provides Guile Scheme APIs, including high-level embedded domain-specific languages (EDSLs) to define packages and whole-system configurations.

Auch an denjenigen, die schon über 20 Jahre mit der Bash arbeiten, sind Bash-Arrays bisher vielleicht vorbeigegangen. Dieser Artikel zeigt, wie man Arrays auch in der Bash verwenden kann, so wie von Perl und anderen Sprachen bekannt.

Arrays ermöglichen es, eine geordnete Folge von Werten eines bestimmten Typs zu speichern und zu bearbeiten. Allerdings erlaubt die Bash nur eindimensionale Arrays. Dabei werden zwei grundlegende Typen von Arrays unterschieden.

Indizierte Arrays verwenden positive Integer-Zahlen als Index. Sie sind meist sparse, die Indizes sind nicht unbedingt zusammenhängend. Wie in C und vielen anderen Sprachen beginnen die ganzzahligen Array-Indizes bei 0. Indizierte Arrays wurden zuerst bei der Bourne-ähnlichen Shell, der ksh eingeführt. Indizierte Arrays tragen immer das Attribut -a.

Assoziative Arrays (manchmal als Hash bezeichnet) verwenden beliebige nichtleere Zeichenketten als Index. Assoziative Arrays sind immer ungeordnet, sie assoziieren nur Index-Wert-Paare. Wenn Sie mehrere Werte aus dem Array abrufen, können Sie sich nicht darauf verlassen, dass diese in derselben Reihenfolge wiedergegeben werden, in der sie eingefügt wurden. Assoziative Arrays tragen immer das Attribut -A. Im Gegensatz zu indizierten Arrays müssen sie immer ausdrücklich deklariert werden.

tl;dr: this post explains how the new openstack-tempest-ci-live-booter package configures a machine to PXE boot a Debian Live system running on KVM in order to run functional testing of OpenStack. It may be of interest to you if you want to learn how to PXE boot a KVM virtual machine running Debian Live, even if you aren’t interested in OpenStack.

NuttX is a real-time operating system (RTOS) with an emphasis on standards compliance and small footprint. Scalable from 8-bit to 32-bit microcontroller environments, the primary governing standards in NuttX are Posix and ANSI standards. Additional standard APIs from Unix and other common RTOS's (such as VxWorks) are adopted for functionality not available under these standards, or for functionality that is not appropriate for deeply-embedded environments (such as fork()).

NuttX was first released in 2007 by Gregory Nutt under the permissive BSD license.

GitLab has integrated CI/CD pipelines to build, test, deploy, and monitor your code.

The benefits of Continuous Integration are huge when automation plays an integral part of your workflow. GitLab comes with built-in Continuous Integration, Continuous Deployment, and Continuous Delivery support to build, test, and deploy your application.

Ignition is a new provisioning utility designed specifically for CoreOS Container Linux. At the the most basic level, it is a tool for manipulating disks during early boot. This includes partitioning disks, formatting partitions, writing files (regular files, systemd units, networkd units, etc.), and configuring users. On first boot, Ignition reads its configuration from a source-of-truth (remote URL, network metadata service, hypervisor bridge, etc.) and applies the configuration.

Even though Ignition only runs once, it packs a powerful punch. Because Ignition runs so early in the boot process (in the initramfs, to be exact), it is able to accomplish configuration all before the userspace has begun booting, which enables advanced features that Container Linux admins require.

Tahoe-LAFS is a Free and Open decentralized cloud storage system. It distributes your data across multiple servers. Even if some of the servers fail or are taken over by an attacker, the entire file store continues to function correctly, preserving your privacy and security.

Motivation

• Moving a file to a friend’s machine, when the humans can speak to each
  other (directly) but the computers cannot

• Delivering a properly-random password to a new user via the phone

• Supplying an SSH public key for future login use

• GitHub - magic-wormhole/magic-wormhole: get things from one computer to another, safely · GitHub

Get things from one computer to another, safely.

This package provides a library and a command-line tool named wormhole, which makes it possible to get arbitrary-sized files and directories (or short pieces of text) from one computer to another. The two endpoints are identified by using identical "wormhole codes": in general, the sending machine generates and displays the code, which must then be typed into the receiving machine.

The codes are short and human-pronounceable, using a phonetically-distinct wordlist. The receiving side offers tab-completion on the codewords, so usually only a few characters must be typed. Wormhole codes are single-use and do not need to be memorized.

Pelican is a static site generator, written in Python. Highlights include:

• Write your content directly with your editor of choice in reStructuredText or Markdown formats
• Includes a simple CLI tool to (re)generate your site
• Easy to interface with distributed version control systems and web hooks
• Completely static output is easy to host anywhere

Look deeply into your Linux code with these Berkeley Packet Filter (BPF) Compiler Collection (bcc) tools.