Linux Cheat Sheet for DevOps Engineers

:::writing{variant=“social_post” id=“71645”} 📒 Linux Commands Every DevOps Engineer Should Know Mastering Linux is a must for anyone in DevOps 🔧 Here are some powerful commands I revisited: 📁 Navigation & Basics • pwd, cd, ls -al 📄 File Operations • cat, nano, vim, head, tail 🔍 Search & Filtering • grep, find, awk, sed 🔐 Permissions • chmod, chown 📊 Monitoring • top, htop, df -h, free -h 🌐 Networking & Processes • curl, wget, ps aux, kill ⚠️ Important lesson: One wrong command (like rm -rf) can cause serious damage — always double-check! Consistency and caution are key when working in production environments. #Linux #DevOps #SystemAdmin #Cloud #TechSkills

Day 2/60 of my DevOps Journey 🚀 Today I dived deeper into Linux and explored how systems actually work behind the scenes. Key Takeaways: ✅ Learned essential commands like `cat`, `touch`, `cp`, and `mv` ✅ Understood file permissions (read, write, execute) and their importance in security ✅ Got introduced to process management and how Linux handles running tasks Hands-on Practice: 🔧 Created files and directories, modified permissions using `chmod`, and explored system processes It’s amazing to see how much control Linux gives over a system — definitely a must-have skill for DevOps! Next step: Setting up my first AWS EC2 instance and connecting via SSH 🔐 #DevOps #Linux #AWS #CloudComputing #LearningInPublic #TechJourney #100DaysOfCode #Consistency

🚨 The first time I opened a Linux server… I saw folders like `/bin`, `/etc`, `/var`, `/home` and thought: “What is all this? And why is everything starting with `/`?” 😅 That confusion led me to learn something very important for DevOps. 💡 𝘋𝘢𝘺 9 𝘰𝘧 𝘮𝘺 𝘋𝘦𝘷𝘖𝘱𝘴 𝘑𝘰𝘶𝘳𝘯𝘦𝘺 Today I learned about the 𝗟𝗶𝗻𝘂𝘅 𝗙𝗶𝗹𝗲 𝗦𝘆𝘀𝘁𝗲𝗺 — the structure that organizes everything inside a Linux system. --- 📖 Think of it like a 𝗺𝗮𝗽 𝗼𝗳 𝘁𝗵𝗲 𝗲𝗻𝘁𝗶𝗿𝗲 𝗼𝗽𝗲𝗿𝗮𝘁𝗶𝗻𝗴 𝘀𝘆𝘀𝘁𝗲𝗺. In Linux, everything starts from a single root directory: 👉 `/` (root) From there, the system branches into different directories, each with a specific purpose. --- Here are some important ones I learned today: 📁 /𝗯𝗶𝗻 Contains essential command binaries like `ls`, `cp`, `mv`. 📁 /𝗲𝘁𝗰 Stores system configuration files. 📁 /𝗵𝗼𝗺𝗲 Personal directories for users. 📁 /𝘃𝗮𝗿 Contains logs, cache, and variable data. 📁 /𝘂𝘀𝗿 Stores system programs and utilities. 📁 /𝘁𝗺𝗽 Temporary files used by applications. --- 🚀 𝘞𝘩𝘺 𝘵𝘩𝘪𝘴 𝘮𝘢𝘵𝘵𝘦𝘳𝘴 𝘪𝘯 𝘋𝘦𝘷𝘖𝘱𝘴? Because when you manage servers, deploy applications, or troubleshoot issues… You constantly interact with these directories. Knowing 𝘄𝗵𝗲𝗿𝗲 𝘁𝗵𝗶𝗻𝗴𝘀 𝗹𝗶𝘃𝗲 𝗶𝗻 𝗟𝗶𝗻𝘂𝘅 saves a lot of time when debugging systems. --- 🔥 𝘔𝘺 𝘣𝘪𝘨𝘨𝘦𝘴𝘵 𝘳𝘦𝘢𝘭𝘪𝘻𝘢𝘵𝘪𝘰𝘯 𝘵𝘰𝘥𝘢𝘺: Linux is not random. Every directory has a 𝘀𝗽𝗲𝗰𝗶𝗳𝗶𝗰 𝗿𝗼𝗹𝗲 𝗶𝗻 𝗸𝗲𝗲𝗽𝗶𝗻𝗴 𝘁𝗵𝗲 𝘀𝘆𝘀𝘁𝗲𝗺 𝗼𝗿𝗴𝗮𝗻𝗶𝘇𝗲𝗱 𝗮𝗻𝗱 𝘀𝘁𝗮𝗯𝗹𝗲. --- 📌 𝘚𝘮𝘢𝘭𝘭 𝘬𝘯𝘰𝘸𝘭𝘦𝘥𝘨𝘦 𝘭𝘪𝘬𝘦 𝘵𝘩𝘪𝘴 𝘣𝘦𝘤𝘰𝘮𝘦𝘴 𝘱𝘰𝘸𝘦𝘳𝘧𝘶𝘭 𝘸𝘩𝘦𝘯 𝘸𝘰𝘳𝘬𝘪𝘯𝘨 𝘸𝘪𝘵𝘩 𝘴𝘦𝘳𝘷𝘦𝘳𝘴 𝘢𝘯𝘥 𝘤𝘭𝘰𝘶𝘥 𝘪𝘯𝘧𝘳𝘢𝘴𝘵𝘳𝘶𝘤𝘵𝘶𝘳𝘦. And that’s exactly what DevOps engineers deal with daily. --- 💬 𝘋𝘦𝘷𝘖𝘱𝘴 𝘦𝘯𝘨𝘪𝘯𝘦𝘦𝘳𝘴 𝘩𝘦𝘳𝘦 — Which Linux directory confused you the most when you started? 😅 --- Learning step by step 🚀 #DevOps #Linux #LinuxFileSystem #LearningInPublic #DevOpsInsiders #TechJourney

🚀 Day 12: Linux Internals for DevOps Engineers (Advanced) 👉 Disk Issues in Production (Not as simple as you think) Most people think: ❌ Disk full → delete files → done But real production issues are more complex. Today I explored how engineers actually debug disk-related failures. 📌 What I learned: 🔹 `df -h` shows disk usage 🔹 `du -sh` helps trace large directories 🔹 Sometimes deleted files still occupy space (hidden usage) 🔹 Log rotation is critical to prevent repeated failures 💡 Real Scenario: Disk shows 100% usage… But you can’t find large files. Why? 👉 Because deleted files are still held by running processes. Solution: ✔ Use `lsof | grep deleted` ✔ Restart the process This is something most beginners don’t know. 🧠 Question for you: Have you ever faced a situation where disk was full but you couldn’t find the files causing it? 👇 Would love to know your experience! 🎯 Learning Goal: To debug storage issues deeply and prevent recurring failures. 📅 Day 13 Tomorrow: Networking Basics (IP, Ports, DNS) Let’s keep going deeper 🚀 #DevOps #Linux #SRE #Storage #CloudComputing #SoftwareEngineering #TechLearning #LearningInPublic #ITCareers #EngineeringMindset #CareerGrowth #ProductionIssues

🐧 Stop Googling, Start Typing: The Ultimate Linux Cheat Sheet! 🚀 Ever feel like the Linux terminal is a secret club you don’t have the password for? It’s time to change that. 💻 Whether you’re a Developer, SysAdmin, Student or DevOps Engineer, mastering the command line isn't just a flex—it’s a massive productivity multiplier. To help you navigate the shell like a pro, I’ve compiled the "Essentials" into one easy-to-save guide. 📌 What’s Inside the Toolkit: 📂 File & Directory Management: Navigate, create, and organize with ease (ls, cd, mkdir, rm). 👤 User & Permissions: Take control of security (chmod, chown, sudo). ⚙️ Process Handling: Monitor and manage system resources like a boss (top, ps, kill). 🌐 Networking Basics: Troubleshoot and connect instantly (ip addr, ping, netstat). Mastering Linux isn't about memorizing 1,000 commands—it’s about knowing the right 20 that get 80% of the work done. 🌟 _______________________________________________________________ 📥 [DOWNLOAD/SAVE THIS POST] 📥 Don't let this get lost in your feed. Hit the Save button and keep this reference handy for your next terminal session! Which Linux command saved your life today? Let's talk in the comments! 👇 #Linux #CheatSheet #SysAdmin #DevOps #Programming #TechSkills #OpenSource #DeveloperJourney #LinuxCommands #Networking #DevopsEngineer #AWS #Linuxpdf

🚀 Mastering Linux File Permissions (A Must for DevOps Engineers) If you're working with Linux, understanding file permissions is non-negotiable. It’s one of those core concepts that directly impacts security, access control, and system stability. 🔑 Here’s a quick breakdown: 📌 Permissions Types - r (read) → View file content - w (write) → Modify file - x (execute) → Run file/script 📌 Who gets permissions? - User (owner) - Group - Others 📌 Numeric (Octal) Representation - 4 = Read - 2 = Write - 1 = Execute 👉 Add them to define permissions: - 7 = rwx (4+2+1) - 6 = rw- (4+2+0) - 5 = r-x (4+0+1) 💡 Example: "rwxrw-r-x" → 765 - User → rwx (7) - Group → rw- (6) - Others → r-x (5) 📌 Why it matters in DevOps? - Securing servers & applications 🔐 - Managing access in production environments - Preventing unauthorized changes If you're learning DevOps, get comfortable with commands like: "chmod", "chown", and "ls -l" 🔥 Tip: Practice by creating files and changing permissions yourself — that’s the fastest way to learn. #Linux #DevOps #Cloud #Learning #SysAdmin #BeginnerFriendly

DevOps is 10% knowing the tools and 90% knowing how to fix things when they break. I’m currently on Day 2 of my deep dive into Linux troubleshooting for DevOps and Cloud roles. It’s one thing to run a command; it’s another to handle a high-pressure scenario when a production server is at 90% capacity. Today’s focus was on the "Surgical Skills" of a Linux Admin: Storage Triage: Finding and truncating massive logs in /var without breaking active processes. The "Kill" Logic: Understanding when to use a polite SIGTERM vs. the forceful kill -9. Automation: Writing health-check scripts to ensure services like Nginx "self-heal" if they go down. Connectivity: Systematically troubleshooting SSH failures from the security group level down to the .ssh permissions. The "shiny" tools like Kubernetes and Terraform are built on this Linux foundation. Strengthening these basics is the only way to build reliable, world-class infrastructure. One step closer to the goal. Onward! #DevOps #Linux #CloudComputing #TechLearning #CareerGrowth #Automation Abhishek Veeramalla

hello everyone I completed this full course Here are a few options for a LinkedIn post based on the "Linux For DevOps In One Shot" video by TrainWithShubham. You can choose the one that best fits your style. Option 1: The "Learning Journey" (Best for showing personal growth) Headline: Why Linux is the Backbone of my DevOps Journey 🚀 I just finished an intensive session on Linux for DevOps, and it’s a game-changer! If you’re in tech, you know that Linux isn't just an OS; it's the foundation of almost everything we do in the cloud. From understanding how the internet works through fiber cables to mastering LVM (Logical Volume Management), this deep dive covered it all. Key takeaways: 🔹 Architecture: Understanding the User -> Shell -> Kernel -> Hardware flow. 🔹 Server Management: Difference between Web Servers (Nginx) and Application Servers. 🔹 Power Tools: Getting hands-on with grep, awk, and sed for log analysis. 🔹 Storage: Learning how to dynamically resize volumes without losing data using LVM. Huge shoutout to @shubhamlondhe1996 for this "One Shot" masterclass. It’s rare to find 5+ hours of pure value in one place! Check it out here: https://lnkd.in/dXE2CZ_p #DevOps #Linux #CloudComputing #TrainWithShubham #ContinuousLearning #TechCommunity Option 2: The "Technical Expertise" (Best for highlighting specific skills) Headline: Mastering the Linux Command Line for DevOps 💻 Efficiency in DevOps often comes down to how well you can navigate a Linux terminal. I’ve been brushing up on my skills with a focus on: ✅ File System Hierarchy: Knowing exactly where logs and configs live. ✅ Process Management: Monitoring and managing system resources effectively. ✅ Shell Scripting: Automating the mundane to focus on the complex. ✅ Advanced Storage: Using Physical Volumes (PV) and Volume Groups (VG) to manage scalable infrastructure. If you are looking to transition into DevOps or strengthen your Linux fundamentals, I highly recommend this comprehensive guide by @TrainWithShubham. It bridges the gap between a "beginner" and "industry-ready" professional. Watch it here: https://lnkd.in/dXE2CZ_p #LinuxAdministration #DevOpsEngineer #SRE #OpenSource #BashScripting #CareerGrowth Option 3: Short & Punchy (Best for quick engagement) Headline: 1 Video. 5 Hours. Complete Linux Mastery. 🐧 Stop scrolling and start learning! I just went through the "Linux For DevOps In One Shot" video and the depth of content is incredible. Whether it's setting up your first server or managing complex logical volumes, this video is a must-watch for every aspiring DevOps Engineer. 🛠️ Favorite part? The breakdown of awk, sed, and grep for data processing. [05:45:15] Full video link: https://lnkd.in/dXE2CZ_p Tag a friend who needs to level up their Linux skills! 👇 #DevOps #Linux #TechTutorial #LearningEveryday #TrainWithShubham

a complete study guide for Linux beginners! If you're getting started with Linux or preparing for a DevOps role, this covers everything you need: ✅ Basic Commands (ls, pwd, cd, mkdir, rm) ✅ File Handling (grep, find, awk, sort) ✅ Process Management (ps, top, kill, nohup) ✅ SSH & SCP for remote access ✅ Cron Jobs & Automation ✅ Shell Scripting (beginner to advanced) ✅ WSL setup for Windows users Linux is the backbone of cloud, DevOps, and backend engineering. Whether you're a student or a professional upskilling — this guide is for you! 🚀 Feel free to save, share, or comment if you found it helpful! 🙌 #Linux #DevOps #CloudComputing #ShellScripting #LearningInPublic #TechNotes #OpenSource

🚀 Day 3/30 – DevOps Journey Today I focused on understanding Linux file permissions, which play a critical role in system security and access control. 💡 Key Learnings: Types of permissions: Read (r), Write (w), Execute (x) Permission groups: User, Group, Others Understanding permission format (e.g., rwxr-xr-x) Using chmod to modify permissions Basics of chown for ownership management 💻 Hands-on: Created files and checked permissions using ls -l Modified permissions using chmod Observed how access changes based on permission settings 📌 Key Takeaway: Linux permissions are essential for securing systems and managing user access in real-world DevOps environments. 🔗 GitHub (Day 3 work): https://lnkd.in/gJVDpbRF Step by step, building strong fundamentals 💪 #DevOps #Linux #Permissions #AWS #LearningJourney #30DaysChallenge