When pushing to GitHub over HTTPS, you’ll see: error: The requested URL returned error: 403 Forbidden while accessing https://github.com/username/repo.git fatal: HTTP request failed This means Git connected to GitHub successfully, but your credentials were rejected. Common causes: Expired or revoked Personal Access Token (PAT) Using a password instead of a PAT (GitHub disabled password auth…
The free command—along with ps, top, kill, pgrep, and dozens of other system utilities—is maintained as part of the procps-ng project. Source repository The source code is hosted at: https://gitlab.com/procps-ng/procps You can clone it with: git clone https://gitlab.com/procps-ng/procps.git cd procps Most distributions package procps-ng, so you likely already have it installed. You can verify the…
Firefox Sync requires an email address and a password to function. The critical question: if someone gains access to your Firefox account or device, can they read your synced passwords without knowing your master password? The short answer: no. Only you with your password can decrypt your synced data. Mozilla’s servers cannot access your encrypted…
The TP-LINK T2U is a USB WiFi adapter based on the MediaTek MT7650U chipset. While Linux kernel support has improved significantly, you may still need to manually compile drivers on some distributions. This guide covers installation on modern Fedora and RHEL-based systems. Check if your adapter is already supported First, plug in the adapter and…
Serializing objects to JSON is a fundamental task in Node.js for APIs, databases, and file storage. The approach depends on your object complexity and performance requirements. Basic Conversion with JSON.stringify The standard approach uses the built-in JSON.stringify() method: const myObject = { name: ‘John’, age: 30, email: ‘john@example.com’ }; const jsonString = JSON.stringify(myObject, null, 2);…
When you open a popup window with window.open(), you’ll often need to detect when the user closes it so you can update your UI, refresh data, or clean up resources. Here are the practical approaches, from polling to event-driven methods. Polling the closed property The simplest method is to periodically check the popup’s closed property:…
When you open a new window with window.open(), you often need to communicate between the parent (opener) window and the child (opened) window. The most straightforward approach is to access the opener window directly through the opener property. Basic Two-Way Communication In the parent window, define a variable: let exchangeVar = ”; From the child…
When you’re processing text with varying amounts of whitespace between fields, the standard cut command falls short. Given input like this: a b c d You need a way to reliably extract fields regardless of how many spaces separate them. Here are the practical approaches. Using tr with cut The tr command can normalize whitespace…
Automating keyboard input on Linux is useful for testing, accessibility workflows, and automation scripts. If you need to simulate pressing multiple keys simultaneously and holding them, xdotool is the standard tool for this job. Basic approach with xdotool The keydown and keyup commands let you press and release individual keys without triggering the other. To…
Getting a file’s size is a common task in Python. There are several ways to do it, depending on what you need and how much detail you want about the file. Using os.path.getsize() The simplest approach is os.path.getsize(): import os file_path = ‘/path/to/your/file.txt’ size_bytes = os.path.getsize(file_path) print(f”File size: {size_bytes} bytes”) This returns the size in…
The window.open() method is the standard way to open URLs in a new browser window or tab. Here’s how to use it effectively in modern JavaScript. Basic Usage To open a URL in a new window or tab: const url = “https://www.systutorials.com”; window.open(url); Most modern browsers will open this in a new tab by default,…
Sending POST requests from client-side JavaScript is a common task, and you have several modern options. The approach you choose depends on your project’s dependencies and browser support requirements. Fetch API (Recommended for Modern Projects) The Fetch API is the modern standard and requires no external library. It’s built into all current browsers and handles…
The most reliable way to get a file extension in Python is os.path.splitext(), which splits a filename into the base name and extension. For modern code, pathlib.Path provides a cleaner alternative. Using os.path.splitext() os.path.splitext() returns a tuple of (name, extension): import os name, ext = os.path.splitext(‘file.txt’) print(name) # ‘file’ print(ext) # ‘.txt’ This works with…
When you need to traverse a directory tree in Python, you have several options. The choice depends on whether you want recursive traversal, how you want to handle the results, and your Python version. Using os.walk() The os.walk() function is the classic approach for recursively iterating through directories. It yields tuples of (dirpath, dirnames, filenames)…
When uploading files to HDFS using hdfs dfs -put, the replication factor defaults to the cluster-wide setting in hdfs-site.xml (typically 3). For temporary files, logs, or staging data, you often want a lower replication factor to reduce write latency and disk usage. Override Replication Factor at Upload Time Use the -D flag to pass HDFS…
When your Node.js application encounters a fatal error or needs to terminate, you need a reliable way to shut it down. Understanding how to exit gracefully—or forcefully when necessary—is essential for production applications. Using process.exit() The most direct method is process.exit(), which immediately terminates the Node.js process: process.exit(); This is a global method that doesn’t…
The URL hash — the fragment identifier after the # — serves several purposes: in-page navigation, client-side routing, and preserving application state. JavaScript provides straightforward APIs to read and monitor hash changes. Reading the Current Hash Access the hash using window.location.hash: const hash = window.location.hash; console.log(hash); // e.g., “#section-about” This returns the hash including the…
When handling POST requests in Node.js, you need to read the incoming data stream and parse it. The approach varies depending on whether you’re using raw Node.js http module, Express, or another framework. Using Express (Recommended) Express handles POST parsing automatically with built-in middleware. This is the standard approach for most modern Node.js applications: const…
While BIOS settings are the preferred way to disable USB 3.0, you can also force USB 2.0 mode on a running Linux system by manipulating the xHCI controller’s port routing register directly using setpci. How it works Intel xHCI controllers use the XUSB2PR (xHC USB 2.0 Port Routing Register) at offset 0xd0. Setting this register…
The simplest way to detect whether your Linux system booted in UEFI or BIOS (Legacy) mode is to check for the existence of the EFI firmware directory. Check for EFI Directory The /sys/firmware/efi/ directory only exists when the system has booted in UEFI mode. If it’s absent, the system is running in BIOS/Legacy mode. […