nixCraft Linux & Unix Sysadmin/DevOps Tutorial Newsletter

[nixCraft]

Welcome to nixCraft Linux/Unix newsletter for Tuesday, 02 February 2021. I hope you will enjoy this version of the newsletter.

• Linux Desktop Fun: Bonsai tree generator for CLI lovers
  Bonsai (盆栽) is nothing but planting in a try. It is old age Japanese art of growing small trees in pots. Now you can do that with your Linux or Unix terminal easily for fun and profit. Let us look into the Bonsai tree generator called cbonsai created in Clang and Bash.
   
• {Review} Linode cloud firewall: Do you need it to protect the Linux server?
  Linode is an original cloud platform and founded before AWS. Back then, we used to call them VPS (Virtual Private Server). Recently they added a new firewall feature to control network access to my Linode server from the Cloud. Let us test drive Linode cloud firewall.
   
• Critical bug in sudo puts Linux and Unix systems at risk
  Any logged-in unprivileged user can abuse an old bug in sudo to gain root privileges. It was rated as an important security issue for Linux and Unix-like operating systems. The Qualys research team has discovered the heap overflow vulnerability in sudo itself has been hiding in plain sight for nearly 10 years. The bug allows any local users to gain root access without authentication (no user’s password needed).
   
• Raspberry Pi Pico released and available at $4 only
  Last year, the Raspberry Foundation also released a brand new version of the Raspberry PI PC (personal computer), and it is directly built into a small-sized keyboard. Now there is more good news for hackers and hardware developers. They just announced their first microcontroller-based product named Raspberry Pi Pico. This small device is priced at only US $4. Unbelievable price. Let us find out about Raspberry Pi Pico hardware specs and software support.
   
• Red Hat introduces new no-cost RHEL option
  As you know, Red Hat recently announced that CentOS Linux 8, as a rebuild of RHEL 8, will end in 2021. CentOS Stream continues after that date, serving as the upstream (development) branch of Red Hat Enterprise Linux. The news met with a strong reaction from the open-source community and CentOS users. Today, Red Hat released a new option where RHEL developer subscriptions can now be used in production environments.
   
• duf - Disk Usage/Free Utility for Linux, BSD, macOS & Windows
  We use the df command to show how much disk space is free on mounted file systems in Linux, macOS, and Unix-like systems. We also have the du command to estimate file space usage. We now have another fancy and fantastic looking tool called duf to display statistics on free disk space in Unix, Linux, macOS, *BSD, Android, and Windows written in Golang.
   
• How to remove carriage return in Linux or Unix
  How do I remove all the carriage returns r (^M) from a file in Unix using the command-line options?
   
• How to password protect directory with Nginx .htpasswd authentication
  I need to restrict access to /app/ directory on Nginx. How do I set up password protect a directory with Nginx .htpasswd authentication on Linux or Unix-like systems?
   
• How to check if bash variable defined in script
  How do I know if a bash variable set at the CLI and used in my bash script running on Linux or Unix-like systems?
   
• How to install Linux VM on FreeBSD using bhyve and ZFS
  Bhyve ("BSD hypervisor") is a free and opensource hypervisor for FreeBSD. We can use Bhyve to run Linux, Windows, and *BSD guest operating system as a virtual machine. Let us see how to install Linux VM using Bhyve on FreeBSD host operating system along with ZFS and bridged networking.
   
• How to set up static IP address on Debian Linux 10/11
  I have Debian 10 Linux cloud server, and it is configured to get IP addresses via DHCP. How do I convert DHCP address to static IP address settings?
   
• How to install Homebrew on macOS to use the brew package manager
  Homebrew is an essential package manager for developers, sysadmins, and power users on macOS. Homebrew allows us to install the latest and updated version of popular applications, packages, and developer tools. Homebrew is the painless way to install required packages on your Mac. For instance, we can install PostgreSQL, Python, PHP, Bash, Nginx, Apache, and much more using brew command. This page explains how to install and use Homebrew on the macOS system to get missing packages.
   
• How to force awk not to print a newline
  Is there any way to tell awk not to print a newline and create the file?
   
• OpenSUSE install Brotli module for Nginx
  How do I install or add Brotli compression support to Nginx on OpenSUSE Linux to speed up my webpages and apps?
   
• How to install ShellCheck on FreeBSD – A shell script static analysis tool
  ShellCheck is easy to use, free, and open-source static analysis tool that automatically finds bugs in your shell scripts. If you write shell scripts for automation or containers, you need this tool. Let us see how to install and use ShellCheck on the FreeBSD development Unix server.
   
• How to upgrade Alpine Linux 3.12 to 3.13
  Alpine Linux version 3.13 has been released. Here is how to upgrade Alpine Linux from 3.11/3.12 to the latest stable version, 3.13 using CLI.
   
• How to find if a website using gzip / deflate compression using curl on Linux and Unix
  How do I verify gzip/ deflate compression support using curl on Linux, macOS and Unix-like systems for remote webserver?
   
• How to Check and print PHP version installed On Linux / Unix Server
  How do I find out PHP version under Linux operating systems? What command do I need to type to show the PHP version under Unix-like systems?
   
• How To - Linux List Disk Partitions Command
  How do I list all hard disk partitions under a Linux operating systems using the CLI and GUI tools?
   
• Bash Shell: Replace a String With Another String In All Files Using sed and Perl -pie Options
  How do I replace a string with another string in all files using sed, Bash or Perl?
   
• How To Install Python On Linux 2.x/3.x latest version
  How do I install python an interactive high-level object-oriented language on Linux operating system?