September 2019 - Page 15 of 66

How To Use IRB to Explore Ruby — step-by-step Programming tutorial on Progressive Robot

How To Use IRB to Explore Ruby

IRB, short for Interactive Ruby, is a REPL (read-eval-print loop) which serves as a quick way to explore the Ruby programming language and try out code without creating a file. In this tutorial, you’ll use IRB to run some code, inspect its output, bring in external libraries, and customize your IRB session.

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FreeBSD 12 — pear-twig-twig — vulnerability — patch and remediation guide — diagnosis and fix on FreeBSD 12

FreeBSD 12 — pear-twig-twig — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 25 May 2026 Affected versions: FreeBSD 12 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: pear-twig — remote code execution Related CVEs: CVE-2015-7809 Upstream summary: Fabien Potencier reports: End users can craft valid Twig code that allows them to execute arbitrary code (RCEs) via the […]

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How to Install and Configure Varnish Cache on FreeBSD 12 — step-by-step FreeBSD 12 tutorial on Progressive Robot

How to Install and Configure Varnish Cache on FreeBSD 12

Introduction This guide explains how to Install and Configure Varnish Cache on FreeBSD 12 on FreeBSD 12. FreeBSD uses the pkg(8) binary package manager, rc.conf(5) for service startup configuration, and pf(4) as its primary packet filter. There is no SELinux or AppArmor — instead, FreeBSD provides the MAC (Mandatory Access Control) framework and Capsicum for […]

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Ubuntu 18.04 — python-psutil — vulnerability — patch and remediation guide — diagnosis and fix on Ubuntu 18.04

Ubuntu 18.04 — python-psutil — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 25 May 2026 Affected versions: Ubuntu 18.04 (bionic) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-4204-1 Related CVEs: CVE-2019-18874 Upstream summary: Riccardo Schirone discovered that psutil incorrectly handled certain reference counting operations. An attacker could use this issue to cause psutil to crash, resulting in […]

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How To Monitor Nagios Alerts with Alerta on Ubuntu 16.04 — step-by-step Linux tutorial on Progressive Robot

How To Monitor Nagios Alerts with Alerta on Ubuntu 16.04

Alerta is a web application used to consolidate and de-duplicate alerts from multiple monitoring systems and visualize them on a single screen. Alerta can integrate with many well-known monitoring tools like Nagios, Zabbix, Sensu, InfluxData Kapacitor, and…

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How to Install pip and Manage Python Packages on Debian 9 — step-by-step Debian 9 tutorial on Progressive Robot

How to Install pip and Manage Python Packages on Debian 9

Introduction This guide explains how to Install pip and Manage Python Packages on Debian 9 on Debian 9 Stretch. Debian Stretch uses systemd for service management, nftables as the underlying packet filter (with ufw or iptables front-ends still available), and AppArmor for mandatory access control. Every command is designed for a minimal Debian 9 install […]

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How To Install and Configure GoCD on Ubuntu 16.04 — step-by-step Linux tutorial on Progressive Robot

How To Install and Configure GoCD on Ubuntu 16.04

GoCD is a powerful continuous integration and delivery platform designed to automate testing and release processes. With many advanced features like the ability to compare builds, visualize complex workflows, and automate build version tracking, GoCD…

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