> ## Content Index > Fetch the complete content index at: https://linuxhandbook.com/llms.txt > Use this file to discover other available public pages before exploring further. # LHB Linux Digest #23.04: Firewall Logs, Bash Tips and FREE Docker eBook - URL: https://linuxhandbook.com/newsletter/23-04/ - Published: 2023-04-05T08:55:01.000Z - Updated: 2023-04-05T08:55:01.000Z - Description: Time for a small gift. Get this Docker Beginner book and start your Docker journey. - Author: Abhishek Prakash - Tags: Newsletter Docker is still ruling the container world. Learning Docker could help your career. You can also use it for your personal homelab setup. I have got a little something for you in this newsletter if you want to start learning Docker. Also, a few readers requested to increase the newsletter frequency from monthly to twice a month. Do you have any preference on how often or not you want to receive the newsletters? Reply to this email and let me know please. **💭 Let's have a look at the interesting things included here:** - Free Docker ebook - Brace expansion and special variables in Bash - Beginner's guide to UFW logging - Memes that only Linux users can understand ## 🫶 Newsletter sponsor: Middleware (YC’23) Middleware is a cloud-native observability platform that provides unified end-to-end visibility into your entire IT stack. It collects, indexes, and correlates logs, traces, and metrics data to offer a complete view of system performance with all the relevant data in one place, making it easier to troubleshoot issues and identify trends. With easy integration and a user-friendly interface, Middleware is a powerful platform that can help businesses of all sizes enhance system performance and reduce downtime. **[Sign up for Middleware](https://middleware.io/?ref=linuxhandbook.com) now to get FREE infrastructure monitoring and APM for two hosts and up to 2M logs.** [Middleware Observability Platform | Cloud-native MonitoringMiddleware observability platform provides complete visibility into your apps & stack, so you can monitor & diagnose issues at scale.![](https://middleware.io/icons/icon-512x512.png?v=b3343aa53b7febb01819bd0eec26a464)Middleware’s logo![](https://middleware.io/images/logo-mw.svg)](https://middleware.io/?ref=linuxhandbook.com) ## 🌱 UFW, Bash Tips and More Ubuntu and many other distros use the UFW firewall. Here's a quick starter on using the UFW logging so that you can see what's going with your firewall. [UFW Logging: Everything You Need to KnowLearn all about UFW logs and how to use them effectively. This comprehensive guide covers everything you need to know about UFW logs.![](https://linuxhandbook.com/content/images/size/w256h256/2021/08/Linux-Handbook-New-Logo.png)Linux HandbookSagar Sharma![](https://linuxhandbook.com/content/images/2023/03/ufw-logs.png)](https://linuxhandbook.com/ufw-logs/) I always find it amusing that even seasoned Linux users are unaware of the awesome brace expansion feature. Yes! It's amazing. Trust me. [Using Brace Expansion in Bash ShellBrace expansion in the bash shell is a lesser known but an awesome feature. Learn about using them like a Pro Linux user with practical examples.![](https://linuxhandbook.com/content/images/size/w256h256/2021/08/Linux-Handbook-New-Logo.png)Linux HandbookAbhishek Prakash![](https://linuxhandbook.com/content/images/2022/11/bash-expansion-in-linux.png)](https://linuxhandbook.com/brace-expansion/) Since we are talking bash, how about getting familiar with the special variables? [Special Variables in Bash Shell \[With Script Examples\]The bash shell has some special variables that have specific usages and purposes. Learn more about them here.![](https://linuxhandbook.com/content/images/size/w256h256/2021/08/Linux-Handbook-New-Logo.png)Linux HandbookSagar Sharma![](https://linuxhandbook.com/content/images/2023/04/special-variables-in-bash-shell-scripting.png)](https://linuxhandbook.com/bash-special-variables/) --- ## Free Docker eBook This little ebook by [Bobby Iliev](https://docker.bobby.sh/?ref=linuxhandbook.com) provides a good introduction to Docker for absolute beginners. [ Introduction to Docker For absolute beginners introduction-to-docker-light.pdf 832 KB download-circle ](https://linuxhandbook.com/content/files/2023/04/introduction-to-docker-light.pdf "Download") --- ## 🛒 Awesome deal for Linux users Learn all about Linux with this mega book bundle from Packt. This library will help you deepen your understanding of the popular open-source OS—whether you’re a system administrator, network engineer, or simply interested in what Linux can do. ⏱ Ends on 10th April 💸 $1 or more ✅ Support Starlight Children’s Foundation with your purchase [Humble Tech Book Bundle: Linux MEGA Bundle by PacktWe’ve teamed up with Packt for our newest bundle. Get books like Mastering Linux Administration. Plus, pay what you want & support charity!![](https://cdn.humblebundle.com/static/hashed/03df0490a53d595fd930f9fff52038366d60a05d.png)Humble Bundle![](https://hb.imgix.net/564c03db77e856d7cda6fc865cba2c8d46dfbf7e.jpg?auto=compress,format&h=630&w=1200&s=2c787654e14bfe93b433fff932666c1f)](https://www.humblebundle.com/books/linux-mega-bundle-packt-books?partner=itsfoss&ref=linuxhandbook.com) --- ## 🗞️ The happenings - The simple but useful command line tool [Curl turned 25](https://daniel.haxx.se/blog/2023/03/10/curl-25-years-online-celebration/?ref=linuxhandbook.com). - [SUSE’s Adaptable Linux Platform](https://www.suse.com/c/suse-salp-raises-the-bar-on-confidential-computing/?ref=linuxhandbook.com) is shaping up good. - [Open Source Summit Europe](https://events.linuxfoundation.org/open-source-summit-europe/?ref=linuxhandbook.com) is announced. Use code OSSEU23FOSS20 at checkout to get 20% off. --- ## 💡 Terminal Tip Used a certain command earlier but cannot remember its exact name anymore? Without exact name, even History command cannot help you much. But the apropos could be of help here. It searches for the given term in the man page. ``` apropos keyword_to_search ``` More on this command here: [Search for Available Linux Commands With aproposCan’t remember a certain Linux command? Use the apropos command and search for it in the available commands.![](https://linuxhandbook.com/content/images/size/w256h256/2021/08/Linux-Handbook-New-Logo.png)Linux HandbookAbhishek Prakash![](https://linuxhandbook.com/content/images/2022/06/apropos-command.png)](https://linuxhandbook.com/apropos-command/) ## 🛠️ Nifty tool Dashy is an open source, highly customizable, easy to use, privacy-respecting dashboard app. Perfect for your homelab. [Dashy | DashyDescription will go into a meta tag in ![](https://dashy.to/img/favicon.ico)Dashy![](https://dashy.to/img/dashy.png)](https://dashy.to/?ref=linuxhandbook.com) --- ## 😂 Geek Humor AWS has a new meaning now :) ![Spiderman meme for devops and AWS folks](https://linuxhandbook.com/content/images/2023/04/devops-meme.jpeg) ## 💌 Love what we do? You can **suggest your friends** subscribe to this newsletter. ([From here](https://linuxhandbook.com/newsletter/)) Want to **read previous newsletters?** You can [access the newsletter archives.](https://linuxhandbook.com/newsletter/) Did I miss something? Or want to suggest something for LHB? You can reply to this mail and say hello world!