The most straightforward approach is os.access(), which tests whether the process has the requested access to a file: import os file_path = “example.txt” # Check if file is readable if os.access(file_path, os.R_OK): print(“File is readable”) # Check if file is writable if os.access(file_path, os.W_OK): print(“File is writable”) # Check if file exists and is executable…
SSHFS (SSH Filesystem) mounts a remote filesystem over SSH, letting you interact with remote files as if they were local. It uses SFTP under the hood, so no additional server configuration is needed beyond SSH access. Install SSHFS on CentOS 7 # Enable EPEL repository sudo yum install epel-release # Install sshfs sudo yum install…
PARSEC is a widely-used CPU-bound benchmark suite containing real applications and complex third-party library dependencies. The installation can be challenging due to these external requirements, but following this guide will get you up and running. Prerequisites Before starting, install the required build tools and libraries: sudo apt-get update sudo apt-get install build-essential pkg-config gettext autoconf…
If you already have PHP and nginx running on Rocky Linux 9 and need to add or update glibc, glibc-common, and GD libraries independently, you can do so safely without disrupting your existing installation. Understanding the dependencies glibc: The GNU C Library β the core runtime library for nearly all C programs on Linux glibc-common:…
In Go, a string is a read-only slice of bytes, while a rune is an alias for int32 representing a Unicode code point. Understanding this distinction is essential when you need to work with individual characters, especially in multilingual text. Basic Conversion The simplest approach is direct type conversion: s := “Hello, δΈη” runes :=…
Sending output to stderr keeps error messages separate from normal program output, making it easier to redirect and filter logs in shell scripts and pipelines. Basic Approach with fmt The simplest method uses fmt.Fprintln() with os.Stderr: package main import ( “fmt” “os” ) func main() { fmt.Fprintln(os.Stderr, “This is an error message”) } This writes…
The traditional Node.js approach uses require(). Create a module that exports functions, then import them where needed. exporting functions (math.js): function add(a, b) { return a + b; } function subtract(a, b) { return a – b; } module.exports = { add, subtract }; importing in another file (app.js): const { add, subtract } =…
Many Go functions accept an io.Reader interface. To pass a string to these functions, use strings.NewReader, which wraps the string without copying itβthe data is read directly from the original string. Basic Usage import “strings” reader := strings.NewReader(“Hello, World!”) This creates an io.Reader that can be passed to any function expecting that interface. The reader…
Finding quality free images for your website means balancing availability, licensing, and actual usability. While generic image search works, specialized repositories are faster and legally safer. Google Image Search (with license filtering) Google Images remains useful for locating free content, but the licensing filter is critical. Use the Advanced Search and filter by usage rights…
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:…
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…
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 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…
The URL hash β the fragment identifier after the # β 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 you have multiple static libraries (.a files) and need to combine them into a single archive, GNU ar provides several approaches. The most straightforward method uses ar‘s MRI mode for clarity and maintainability. Using ar MRI Mode The cleanest approach is to use ar -M with an MRI script. This method is explicit and…
When sending POST requests through a Squid proxy with curl, you may encounter a proxy error that blocks the request, even though the same request works fine with GET. The issue typically appears as: ERROR The requested URL could not be retrieved The root cause is the Expect: 100-continue header that curl automatically adds to…
[md] vbetool is a utility for executing real-mode x86 BIOS calls, commonly used for power management and display mode switching on legacy systems. Rocky Linux 9 doesn’t include it in standard repositories, so you’ll need to build it from source. ## What vbetool Does vbetool communicates with the video BIOS through the Video BIOS Extensions…
Deleted photos from your Samsung phone aren’t necessarily gone foreverβthey remain on disk until overwritten. Here’s how to recover them. Act quickly to preserve data The moment you realize photos are deleted, stop using your phone. Every new photo, message, or app activity risks overwriting deleted data. Turn off WiFi and mobile data to prevent…
musl libc is a lightweight C library implementation that’s useful for creating statically-linked binaries, containerized applications, and embedded systems. It’s the standard C library in Alpine Linux and increasingly common in production environments. Installation from distribution repositories The simplest approach is installing musl from your distribution’s repositories: sudo apt update sudo apt install musl musl-dev…