Linux Howtos, Tutorials & Guides
The sed command, short for Stream Editor, is one of the most powerful text-processing tools in Linux. It allows users to search, replace, insert, and delete text in files or data streams — all without opening the file in an editor. Whether you’re an experienced Linux administrator or a beginner learning shell scripting, understanding the …
System administrators frequently manage multiple text-based configuration files in Linux, located under /etc/ and application directories. Editing each manually can be time-consuming, especially on large-scale systems. That’s why advanced Linux users use sed and awk to modify config files in Linux — two powerful command-line utilities that automate text editing, pattern searching, and data extraction. …
If you’ve ever monitored your Linux system and seen that nearly all RAM appears “used,” you might worry you’re running out of memory. But Linux aggressively uses free memory for caching to speed up file and disk operations. In some scenarios—benchmarking, debugging, or managing memory pressure—you may want to clear RAM cache in Linux. In …
Running out of space on the Linux root partition (/) can cause failed updates, application errors, and even system crashes. Fortunately, you can extend root partition in Linux safely with the right tools and backups.This guide explains multiple methods—using GParted, Logical Volume Manager (LVM), or shrinking another partition—based on your setup. Understanding the Root Partition …
When working with Linux, every command you run produces a special numeric result called an exit status or return code. This number quietly tells you whether the command was executed successfully or if it failed. Knowing how to check exit status in Linux is an essential skill for system administrators, developers, and anyone learning Bash …
Linux systems run a variety of system services (daemons) in the background — such as process management, cron jobs, logging, SSH, DNS, web servers, and more. As a system administrator, it is essential to know how to list running services in Linux to ensure that critical services are active, unnecessary ones are disabled, and your …
Linux is a powerful operating system known for its flexibility and automation capabilities. One of the most common requirements for system administrators and developers is to auto execute commands or scripts during reboot or startup. This automation ensures that essential services, applications, or maintenance tasks run without manual intervention each time the system boots. In …
Monitoring open network ports is one of the most important tasks for system administrators, developers, and network engineers. Every service running on a Linux system communicates over a port, either using TCP (Transmission Control Protocol) or UDP (User Datagram Protocol). Being able to watch TCP and UDP ports in real-time helps detect unauthorized connections, troubleshoot …
the world of system administration, networking is at the heart of server management. Whether you are configuring a new server, troubleshooting connectivity issues, or monitoring network performance, knowing the right Linux Networking Commands is essential for a Sysadmin. Linux Networking Commands for Sysadmins: This guide covers the most important Linux networking commands every Sysadmin should …
This lesson we’re going to talk about how you prioritize processes (manipulate Process Priority in Linux) they’re running on a Linux system. In my previous article, I had explained following concepts and I would request you to read that guides: How Linux handles Processes How to Kill a Process (Terminate a running process) in Linux …