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Linux Tips

A blog by Blogger in CodeName Blogs

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Entries in this blog

Ansible Yum Module: Manage Red Hat Packages

by: Umair Khurshid Mon, 21 Jul 2025 17:00:49 +0530 Modern infrastructure operations depend on automation not only for efficiency, but also for repeatability. Among the many tasks automated in daily workflows, package management is one of the most frequent. For systems based on RPM package formats such as Red Hat Enterprise Linux (RHEL), CentOS, AlmaLinux, Rocky Linux, and older versions of Fedora, Ansible provides a native module that integrates directly with the yum package manager. While newe

LHB Linux Digest #25.18: Journalctl Logs, Restore Containers, Bash Test, Better Diff and More

by: Abhishek Prakash Fri, 18 Jul 2025 17:00:30 +0530 The AWK series continues with two more chapters. I have changed my initial plan to completely publish the AWK series in a couple of weeks. Instead, I'll go for two new chapters each week. The good thing is that we also have an upcoming systemd series by our partner educator, and it should be published next week. I hope you like learning from these new series 💪 💡Next Friday (25th July) will be Sysadmin appreciation day. Would be nice to plan

Chapter 5: Manipulating Strings in AWK

by: Abhishek Prakash Fri, 18 Jul 2025 10:47:19 +0530 AWK isn't just a text processor - it's your personal calculator and string manipulation wizard rolled into one. You have already experienced AWK's mathematical capabilities. Now explore the string functions. AWK offers a bunch of built-in functions to deal with strings. Here's a quick look at them: Function Purpose Syntax Example Result length(s) String length length(string) length("hello") 5 substr(s,p,n) Extract substring substr(st

Chapter 4: Mathematical Operations in AWK

by: Abhishek Prakash Fri, 18 Jul 2025 10:45:01 +0530 AWK handles numbers like a built-in calculator. I would say like a scientific calculator, as it has several built-in mathematical functions. You can perform mathematical operations directly on your data fields without any special setup. Let me create some sample files for you to work with: sales_report.txt: Product Price Quantity Discount_Percent Laptop 1299.99 5 10 Desktop 899.50 3 15 Tablet 599.00 8 5 Monitor 349.99 12 20 Keyboard 99.99 15

LHB Linux Digest #25.17: AWK Series, at command, Docker Copy, Pangolin and More

by: Abhishek Prakash Fri, 11 Jul 2025 18:12:43 +0530 I told you about the AWK tutorial series in the previous newsletter. Well, it has an awkward start. I thought I would be able to finish, but I could only complete the first three chapters. Accept my apologies. I have the additional responsibilities of a month-old child now 😊 Still, please feel free to explore this work in progress and share your feedback. Mastering AWK as a Linux System AdministratorTransform from basic text processing to adv

Chapter 3: Built-in Variables and Field Manipulation

by: Abhishek Prakash Fri, 11 Jul 2025 17:37:02 +0530 You already saw a few built-in variables in the first chapter. Let's have a look at some other built-in variables along with the ones you already saw. Repitition is good for reinforced learning. Sample Data Files Let me create some sample files for you to work with. Save these to follow along the tutorial on your system: Create access.log: 192.168.1.100 - alice [29/Jun/2024:10:15:22] "GET /index.html" 200 1234 192.168.1.101 - bob [29/Jun/202

Chapter 2: Pattern Matching and Basic Operations

by: Abhishek Prakash Fri, 11 Jul 2025 17:35:12 +0530 Think of AWK patterns like a security guard at a nightclub - they decide which lines get past the velvet rope and which actions get executed. Master pattern matching, and you control exactly what AWK processes. Pattern matching fundamentals AWK patterns work like filters: they test each line and execute actions only when conditions are met. No match = no action. Here are some very basic examples of pattern matching: awk '/ERROR/ {print $0}' l

Chapter 1: Introduction to AWK

by: Abhishek Prakash Fri, 11 Jul 2025 17:33:37 +0530 If you're a Linux system administrator, you've probably encountered situations where you need to extract specific information from log files, process command output, or manipulate text data. While tools like grep and sed are useful, there's another much more powerful tool in your arsenal that can handle complex text processing tasks with remarkable ease: AWK. What is AWK and why should You care about it? AWK is not just a UNIX command, it is

LHB Linux Digest #25.16: AWK, History, YAML Validation, Mastering Top and More

by: Abhishek Prakash Fri, 04 Jul 2025 17:30:52 +0530 Is it too 'AWKward' to use AWK in the age of AI? I don't think so. AWK is so underrated despite being so powerful for creating useful automation scripts. We have had a very good intro to AWK and now I am working on a series that covers the basics of AWK, just like our Bash series. Hopefully, you'll see it in the next newsletter. Stay tuned 😊       This post is for subscri

Ansible 101: Install, Configure, and Automate Linux in Minutes

by: Adnan Shabbir Fri, 04 Jul 2025 05:43:38 +0000 In this technologically rich era, businesses deploy servers in no time and also manage hundreds of devices on the cloud. All this is possible with the assistance of Ansible-like automation engines. Ansible is an automation server that manages multiple remote hosts and can deploy applications, install packages, troubleshoot systems remotely, perform network automation, configuration management, and much more, all at once or one by one. In today

LHB Linux Digest #25.15: New Docker eBook, Declare in Bash, Debug Ansible Playbook and More

by: Abhishek Prakash Fri, 27 Jun 2025 18:29:17 +0530 We have converted our text-based Docker course into an eBook; Learn Docker Quickly. It is available for free to LHB Pro members along with all the other eBooks in the resources section. If you are not a Pro member, you can either opt for the Pro membership or purchase just this ebook from our Gumroad page. I am working on the next series and hopefully, you'll see it in July. Stay tuned 😄      

Using Bash Declare: Gateway For Effective Variable Management

by: Abhishek Prakash Tue, 24 Jun 2025 13:49:11 +0530 Ever wondered how to make your bash scripts more robust and professional? The declare command in bash is your secret weapon for proper variable management! Alright! So, variables in bash don't have any types and you can simply use them as name=value . That's not surprising. What you might not know is that you can control variable types, scope, and behavior by using declare with your variables. Interesting, right? What is Declare in Bash? The

10 Bash Scripts to Automate Daily Linux SysAdmin Tasks

by: Adnan Shabbir Mon, 23 Jun 2025 13:40:56 +0000 Bash (Bourne Again Shell) is a free and open-source shell and scripting language. Its journey started in the late 80s, and since then, the Bash has been adopted by routine Linux users and Linux SysAdmins. Bash has automated the daily tasks of a Linux System Administrator. A Linux SysAdmin has to spend hours running scripts and commands. Not only the SysAdmins, but the simplicity and easy-to-learn capability of Bash have automated the tasks of a

How to Use Ansible for Automated Server Setup

by: Adnan Shabbir Mon, 23 Jun 2025 12:34:03 +0000 Basic Workflow of Ansible | What components are necessary sudo apt update sudo apt install ansible ansible --version Ansible Control Node IP: 192.168.140.139 (Where Ansible is configured) Ansible Host IPs: { Server 1 [172.17.33.7] Server2 [192.168.18.140] } Inventory File: Default inventory file location: /etc/ansible/hosts. Usually, it is not available when we install Ansible from the default repositories of the distro, so we nee

LHB Linux Digest #25.14: Named Pipes, Find-Exec, Ansible Cron, Dockman and More

by: Abhishek Prakash Fri, 20 Jun 2025 18:38:14 +0530 Here’s your curated dose of Linux news, tutorials, and updates to keep you informed and productive in your open-source journey. Find with exec Named and unnamed pipes in Linux Container lifeycycle commands Clickhouse and Dockman And regular dose of important news, tips and memes       This post is for subscribers only Subscribe now

LHB Linux Digest #25.13: lsattr, chattr Commands, Self-host Obsidian, Vert and More

by: Abhishek Prakash Fri, 13 Jun 2025 19:18:07 +0530 Another week, another chance to pretend you're fixing something important by typing furiously in the terminal. You do that, right? Or is it just me? 😉 This week's highlights are: lsattr, chatter and grep commands brace expansions VERT converter And your regular dose of news, memes and tips ❇️ Explore DigitalOcean with $100 free credit DigitalOcean is my favorite alternative to the likes of AWS and Azure and Google Cloud. I use it to host Linu

Self-host Obsidian using Docker and Access it Via Web Browser

by: Abhishek Kumar Fri, 13 Jun 2025 18:48:38 +0530 Note-taking has come a long way from crumpled sticky notes and scattered .txt files. Today, we want our notes to be searchable, linked, visualized, and ideally, available anywhere. That’s where Obsidian shines. Source: Obsidian.mdBuilt around plain-text Markdown files, Obsidian offers local-first knowledge management with powerful graph views, backlinks, and a thriving plugin ecosystem. For many, it has become the go-to app for personal know

LHB Linux Digest #25.12: Vim Mouse Mode, Dir Command, Sticky Bits and More

by: Abhishek Prakash Fri, 06 Jun 2025 17:33:26 +0530 Lesser known... that's the theme of this week's newsletter. Hope you like it 😄 Here are the highlights of this edition : Lesser known mouse mode in Vim Lesser known dir command in Linux Lesser known special file permissions And your regular dose of better known memes, tips and news ;) 🚀 Level up your coding skills and build your own bots Harness the power of machine learning to create digital agents and more with hot courses like Learning Lan

Using Tabbed Interface in Vim

by: Abhishek Prakash Fri, 06 Jun 2025 16:15:07 +0530 Think of Vim tabs like browser tabs for your code editor - each tab holds one or more windows, letting you organize multiple files into logical workspaces. Unlike window splits that divide your screen, tabs stack contexts you can flip between instantly. Three files opened in separate tabs in VimLet's see how you can use tabs in Vim. Essential Vim tab commands at a glance Here are the most common actions you can use while dealing with tabs in

SSH Config Generator

by: Abhishek Prakash Wed, 04 Jun 2025 20:37:04 +0530 This tool lets you generate the SSH config entries quickly. Fill the fields and hit the generate button and copy the entries to your SSH config file. /* Catppuccin Mocha Color Palette */ :root { --ctp-base: #1e1e2e; --ctp-mantle: #181825; --ctp-surface0: #313244; --ctp-surface1: #45475a; --ctp-surface2: #585b70; --ctp-overlay0: #6c7086;

Using Mouse Mode in Vim

by: Abhishek Prakash Wed, 04 Jun 2025 12:11:12 +0530 I hope I am not committing blasphemy but you can use the mouse in Vim. Press Esc to go to command mode in Vim and use: :set mouse=a It will enable mouse mode immediately in all Vim modes, i.e. normal, insert and visual. To disable the mouse mode, use this: :set mouse=If you want to use mouse mode all the time, I am not judging you, add this entry to your ~/.vimrc file: set mouse=aSave, restart Vim, and your mouse now works for clicking, scrol

Windows Subsystem for Linux is now Open Source

by: Adnan Shabbir Wed, 04 Jun 2025 04:44:46 +0000 Windows Subsystem for Linux (WSL) allows you to run Linux distros within the Windows operating system. WSL is available in multiple versions: WSL1 (older but still supported) and WSL2 (newer with continuous development support). Recently, on May 19, 2025, Microsoft conducted a 2025 Build Conference where they announced the open-source nature of WSL for Windows, which is huge news for Linux users and the open-source community. In today’s guide,

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