A complete guide to Linux/Unix signals and process management. Learn how Ctrl+C, Ctrl+Z, kill, pkill, nohup, &, and tmux work behind the scenes. Discover how to gracefully terminate processes, run tasks in the background, keep services alive after logout, and manage multiple sessions with tmux for efficient system administration. 1. Introduction In the Linux/Unix world,…

Back when I started managing servers, I remember staring at the terminal, completely lost. The blinking cursor felt like it was mocking me. Fast forward a few years, and now Linux Commands feel as natural as breathing. Whether you’re currently managing Linux servers or planning to, these twenty Linux Commands will prove essential time and time again. 1. ssh…

Text processing is a cornerstone of Linux system administration and development. Whether you’re parsing logs, transforming data, or automating tasks, tools like grep, awk, sed, and jq are indispensable. Each of these command-line utilities has unique strengths, and together they form a powerful toolkit for manipulating text and data in Linux. In this comprehensive guide, we’ll explore what each tool…

How to fix Mac app “damaged” or “unable to identify developer” errors When downloading and opening an app on a Mac, you often encounter the following error message: If you encounter these problems, you can solve them by following the steps below: Step 1: Enable “Any Source” downloads This allows the app to be downloaded…

Problem Description When downloading an APP or PKG installer from the Internet on a Mac, a prompt may appear indicating that it cannot be opened: This is because your Mac’s security mechanism prevents you from opening programs that come from unknown sources or that may contain viruses. Workaround Simple solution(recommend) This can be turned on…

Solution to the problem that Mac application prompts “damaged” and cannot be opened When downloading an app on your Mac, you might get an error message saying “XXX is damaged and cannot be opened,” preventing you from using the app properly. This is usually because there’s a problem with the app’s signature information during the…

How to disable SIP (System Integrity Protection) on Mac Starting with OS X El Capitan, Apple added System Integrity Protection (SIP) to protect system files and directories from accidental or malicious modification. While this is beneficial for system security, it’s sometimes necessary to disable it for specific modifications. Here’s how to disable SIP on a Mac: What…