When you need to reach a server through one or more intermediate hosts, you can establish a direct connection without manually chaining SSH sessions. This is essential for accessing internal servers that aren’t directly reachable from your workstation. The scenario laptop —-> proxy —-> server You want to connect to server.example.com through proxy.example.com as if…
If you’re running a dual-boot system with Windows, you’ll need to configure which operating system loads by default. The method depends on your Windows version and whether you’re using legacy BIOS or UEFI firmware. Windows 7 and Vista: System Properties Method For Windows 7 systems using the traditional boot manager: Open Control Panel and navigate…
Fedora upgrades are straightforward with dnf system-upgrade, the standard tool for network-based distribution upgrades. This replaces the older fedup tool and handles everything from downloading packages to managing the upgrade environment. Pre-Upgrade Checklist Before starting any upgrade: Update your current system: sudo dnf upgrade Back up critical data — especially /etc, home directories, and application…
Fedora uses FirewallD as its default firewall management service. If you’re running servers in a trusted internal cluster or isolated environment where network-level filtering isn’t needed, you can disable it entirely. Stop and Disable FirewallD To completely disable the firewall: sudo systemctl stop firewalld sudo systemctl disable firewalld The stop command halts the service immediately….
Bash doesn’t have a goto statement, and that’s intentional. The language is designed to encourage cleaner control flow patterns that are easier to debug and maintain. When you feel the urge to jump around in your script, there’s almost always a better approach. Functions and Early Return The cleanest pattern is extracting logic into functions…
Domain registration pricing has commoditized significantly over the past few years. Most registrars cluster around similar price points, and permanent discounts are increasingly rare. Rather than chasing one-off coupons that expire or have restrictive terms, understanding how registrars price domains and what you actually need will serve you better. Current Market Rates As of 2026,…
When managing user accounts on a cluster or application, you’ll often need to generate temporary passwords programmatically. Here’s a practical approach using Scala’s built-in utilities. Basic implementation with scala.util.Random For non-security-critical use cases, here’s a straightforward generator: def randomString(len: Int): String = { val rand = new scala.util.Random() val chars = “0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz” (0 until len).map(_…
The passwd command is the standard tool for changing your password on Linux systems. It works across all distributions and doesn’t require administrative privileges for changing your own password. Basic password change Log in to your Linux system and run: passwd You’ll be prompted for: Your current password (to verify your identity) Your new password…
WhatsApp dominates global messaging, but several strong alternatives exist depending on your use case, privacy requirements, and regional adoption. Here’s what’s actually worth considering in 2026. Messaging Apps Built for Mobile Signal The gold standard for privacy-conscious users. Signal uses end-to-end encryption by default for all messages, calls, and group chats. Open source, no ads,…
By default, WordPress contributors can submit and edit their own posts, but they can’t upload media files. If you want contributors to attach images or documents to their submissions, you’ll need to grant them the upload capability. Method 1: Using User Role Editor Plugin The User Role Editor plugin is the most straightforward approach for…
When you work with multiple git servers or need different credentials for different hosts, SSH’s config file lets you specify which key to use for each server. This is cleaner than managing aliases or environment variables. Setting Up ~/.ssh/config Create or edit ~/.ssh/config and add entries for each server: Host git.example.org Port 22111 IdentityFile ~/.ssh/id_rsa.git.example.org…
When deprovisioning Linux VMs in public cloud environments, disk blocks may be reallocated to other customers if the provider doesn’t properly wipe storage. This is a legitimate concern for security audits, compliance validation, and understanding data exposure risks. Quick Recovery Method The most straightforward approach uses dd and strings to extract readable data from block…
When you need to execute a system command and capture its output in C, popen() is the standard approach. Unlike system(), which just runs a command, popen() gives you a file stream connected to the command’s stdout or stdin. Basic Usage The popen() function signature is: FILE *popen(const char *command, const char *type); The type…
You can delete cookies from individual sites without clearing your entire browser cache. Here’s how: Via Settings UI Open chrome://settings/privacy in the address bar (or go to Settings > Privacy and security) Click Cookies and other site data Click All cookies and site data Use the search box to find the domain you want to…
There are several reliable methods to generate random strings of a specific length in bash. The choice depends on your character set requirements and use case. Using tr with /dev/urandom The tr command combined with /dev/urandom is the most portable and straightforward approach: tr -dc “[:alpha:]” < /dev/urandom | head -c 10 This produces a…
Sending sensitive information via email requires careful consideration. Whether you’re sharing financial details, credentials, or confidential documents, there’s no single “secure email” solution that eliminates all risk — you need to match the method to your threat model. Understand the Risk Standard email transmits in plaintext across multiple servers. Even with TLS in transit, your…
WordPress Twenty Thirteen theme shows full post content on archive pages by default. Using excerpts instead keeps archive pages clean and improves page load speed by showing just a summary of each post. Enable Excerpts on Archive Pages Add this to your theme’s functions.php or a custom plugin: function twentythirteen_excerpts_on_archives($content) { if (is_archive() || is_home())…
Install the required LAMP stack components. Fedora 41 and later use dnf instead of yum: sudo dnf install httpd php php-mysqli php-gd mariadb-server Note that php-mysql is deprecated; use php-mysqli instead for modern MySQL/MariaDB connections. Start and enable the services to run on boot: sudo systemctl start mariadb httpd sudo systemctl enable mariadb httpd Using…
The most reliable way to keep your iPhone contacts synchronized with Google is through CardDAV, Google’s contact synchronization protocol. This works on modern iOS versions and automatically syncs changes in both directions. Using Native iOS CardDAV Setup Navigate to Settings > Mail > Accounts > Add Account: Select Other at the bottom of the account…
Fedora uses RPM packages managed by DNF, but you’ll occasionally encounter software distributed only as .deb files (Debian format). You have several options: convert the .deb to RPM, extract and repackage it, or use containerization. Here’s what works in practice. Using alien to convert .deb to RPM The simplest approach is alien, a tool designed…