37 posts tagged with "Linux"

Parse a 10GB log file in seconds — no Python needed. These three commands — grep, sed, and awk — are the most powerful text processing tools in Linux. Master them and you'll handle log analysis, data transformation, and configuration management faster than any scripting language.

Your application ran fine for three weeks. Then at 2 AM, the container was killed with exit code 137. No error in the application logs. No exception. Just dead. The culprit: the Linux OOM (Out of Memory) killer. Your container consumed all available memory, and the kernel chose violence. Resource limits prevent this — but most people never set them, and those who do often set them wrong.

Your scripts work on your machine — here's how to make them production-ready. In Parts 1 and 2, we learned the fundamentals and built real scripts. Now we'll add the guardrails that separate "works on my laptop" from "safe to run in production at 3 AM with nobody watching."

6 scripts you can use in production today — copy, customize, deploy. In Part 1, we covered the fundamentals of shell scripting. Now it's time to build real scripts that solve real problems.

You're doing the same 15 commands every deployment — let's turn that into one script. Shell scripting is the automation backbone of Linux. Every DevOps engineer writes shell scripts daily, and mastering the fundamentals will save you hours every week.

You have 50 servers. They all need the same packages, the same firewall rules, the same user accounts, and the same application config. You could SSH into each one manually, or you could write a script and hope it handles every edge case. Or you could use a configuration management tool that guarantees the desired state of every server, every time, no matter how many you have.