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Languages & Frameworks

Client-Side Routing in AngularJS: Managing Route Parameters
Byjameswarner Aug 19, 2016Apr 12, 2026

AngularJS routing enables single-page applications by dynamically switching views based on URL patterns without full page reloads. Unlike server-side routing, AngularJS handles routing on the client, eliminating network round-trips and improving responsiveness—particularly useful when displaying different datasets based on route parameters. Install AngularJS and Dependencies Include AngularJS and the routing module. Using npm: npm install…

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Languages & Frameworks

Quartz Job Scheduling in Java: Setup, Triggers, and Best Practices
ByAaronjacobson Aug 16, 2016Apr 12, 2026

Quartz is an open-source Java library for scheduling background jobs and tasks. Whether you need to execute work at specific times, on recurring intervals, or in response to events, Quartz provides a robust scheduling framework that integrates with standalone applications, application servers, and clustered environments. Core Features Embeds directly into standalone or web applications Supports…

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Linux & Systems Administration

Changing Your Linux Password Over SSH
ByEric Ma Aug 7, 2016Apr 13, 2026

Open a terminal and connect to the server: ssh USER@HOST Replace USER with your username and HOST with the server’s hostname or IP address. On first connection, SSH will display the host key fingerprint: The authenticity of host ‘HOST (IP_ADDRESS)’ can’t be established. ECDSA key fingerprint is SHA256:xxxxxxxxxxxx. Are you sure you want to continue…

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Linux & Systems Administration

How to Unmount a Busy Filesystem in Linux
ByEric Ma May 21, 2016Apr 12, 2026

When you try to unmount a filesystem with umount, Linux may report “device is busy.” This is a safety mechanism — the kernel blocks unmounting when processes or kernel threads are actively accessing the partition or holding open files on it. Forcing an unmount without understanding what’s using the filesystem risks data corruption and data…

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Linux & Systems Administration

How to Enable and Disable Your Laptop Keyboard in Linux
ByEric Ma May 14, 2016Apr 12, 2026

When you dock a laptop with an external USB keyboard, the built-in keyboard becomes a nuisance—it’s too easy to brush keys while typing and trigger unwanted input. Rather than disabling the keyboard at the BIOS level or physically disconnecting it, you can use the xinput tool to disable and re-enable it from within your Linux…

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Development Best Practices

Automatically Move Spam to Junk in Thunderbird
ByEric Ma May 7, 2016Apr 12, 2026

Thunderbird’s adaptive junk filter can effectively reduce spam once configured and trained, but it doesn’t automatically move flagged messages by default. Here’s how to set it up properly. Enable automatic movement for incoming mail Access your account settings: Linux/Windows: Edit → Account Settings macOS: Thunderbird → Settings → Accounts Select your email account and click…

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Scripting & Utilities

Finding Your Bash Script’s Location: $0 vs ${BASH_SOURCE[0]}
ByEric Ma Feb 14, 2016Apr 13, 2026

When a Bash script needs to reference its own location — for sourcing additional files, logging, or managing relative paths — $0 seems like the obvious choice. But it’s a trap: $0 behaves differently depending on whether your script is executed directly or sourced. The Problem with $0 When you execute a script directly: ./script.sh…

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Linux & Systems Administration

Configuring a Static IP Address on Fedora, RHEL, and CentOS
ByEric Ma Jan 30, 2016Apr 13, 2026

NetworkManager is the default network management tool on modern Fedora, RHEL, and CentOS systems. You can configure static IPs either through the CLI or by editing configuration files directly. This guide covers both approaches for Fedora 41+ and RHEL 9+. Identify your network interface Start by listing all available network interfaces: ip link show or…

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Web Development

Running Commands Across Multiple Linux Servers in Parallel
ByEric Ma Jan 3, 2016Apr 12, 2026

Running commands across multiple servers is fundamental to cluster management and infrastructure automation. While orchestration tools like Ansible and Terraform dominate modern deployments, sometimes you need lightweight solutions that work without dependencies—or you’re already invested in SSH-based infrastructure. When managing clusters, you typically work in two modes: serial execution (one node at a time) and…

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Linux & Systems Administration

Set Google as Default Search in Firefox on Linux Mint
ByEric Ma Dec 12, 2015Apr 13, 2026

Firefox on Linux Mint doesn’t include Google in its default search engine list. Linux Mint deliberately curates search engines based on revenue-sharing agreements — only search engines that share ad revenue with Linux Mint appear by default. Google doesn’t participate in this arrangement, so you need to add it manually if you prefer it over…

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Linux System Configuration

Getting Started with Linux for Developers
ByEric Ma Nov 29, 2015Apr 12, 2026

Before writing code, get comfortable with fundamental Linux commands. You’ll use these daily: File operations: ls, cd, cat, less Text search: grep, ripgrep (rg) Remote access: ssh, scp, rsync Session management: tmux or screen for persistent terminal sessions Shell: bash (default on most distributions), though zsh and fish are popular alternatives Start with built-in documentation….

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System Administration & Cloud

Optimizing Large File Uploads to S3 with AWS CLI
ByEric Ma Nov 29, 2015Apr 12, 2026

Install AWS CLI v2 through your system’s package manager for production deployments. On Debian/Ubuntu: sudo apt-get update sudo apt-get install awscli On RHEL/CentOS/Fedora: sudo dnf install awscli Or use the official installer directly: curl “https://awscli.amazonaws.com/awscli-exe-linux-x86_64.zip” -o “awscli-v2.zip” unzip awscli-v2.zip sudo ./aws/install Verify installation: aws –version Configure AWS CLI credentials Set up credentials interactively: aws configure…

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Languages & Frameworks

Robust PHP RSS Feed Parsing with Caching and Error Handling
ByEric Ma Nov 13, 2015Apr 12, 2026

Parsing RSS feeds in PHP remains a common requirement for content aggregation. This guide covers practical patterns for fetching feeds, caching results, extracting content, and sanitizing output — with implementations that work reliably in production. Basic RSS Feed Parsing PHP’s SimpleXML extension provides a straightforward way to parse RSS feeds: <?php $feed_url = ‘https://example.com/feed.xml’; $feed…

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Development Best Practices

Export PowerPoint Slides at Higher DPI for Better Print Quality
ByEric Ma Nov 3, 2015Apr 12, 2026

PowerPoint exports slides at 96 DPI by default, which is too low for professional printing. Print shops typically require 150 DPI for acceptable quality or 300 DPI for high-quality output. The UI export options in PowerPoint don’t reliably control the actual output DPI—you need to change a registry setting on Windows or use alternative methods…

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Linux & Systems Administration

Running Flash Content on Linux: Ruffle and Legacy Options
ByEric Ma Oct 18, 2015Apr 12, 2026

Flash is dead on the web. Adobe ended support on December 31, 2020, and all modern browsers removed plugin support years ago. If you need to view Flash content in 2026, you have two practical options: the Ruffle emulator or running legacy applications in isolated environments. Why Fresh Player Plugin and PPAPI Don’t Work Anymore…

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Linux & Systems Administration

SSH Keep-Alive: Preventing Idle Connection Timeouts
ByEric Ma Sep 13, 2015Apr 12, 2026

SSH connections dropping during idle periods is a persistent issue in production environments. Both client and server configurations provide built-in keep-alive mechanisms designed specifically for this problem. Stop running while true; do uptime; sleep 30; done — there are proper solutions. Client-side configuration Per-user SSH config Add to ~/.ssh/config: Host * ServerAliveInterval 60 ServerAliveCountMax 3…

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Linux & Systems Administration

Linux Checksum Tools: Performance Comparison
ByEric Ma Sep 5, 2015Apr 12, 2026

When verifying file integrity on Linux, you’ll typically reach for one of several checksum utilities. A natural question: which one is fastest? The answer depends heavily on whether I/O or CPU is your bottleneck. Disk I/O Dominates on Most Systems In realistic scenarios with typical storage, disk I/O is almost always the limiting factor. Test…

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Linux & Systems Administration

Monitor File Changes and Trigger Commands with inotifywait
ByEric Ma Aug 30, 2015Apr 12, 2026

Watching for filesystem changes and triggering actions is essential for development workflows—recompiling after source edits, restarting services when configs update, or running tests during coding. Linux’s inotify subsystem provides kernel-level file monitoring, and inotifywait makes it accessible from the command line. Installation Install inotify-tools on your system: Fedora/RHEL/CentOS: sudo dnf install inotify-tools Debian/Ubuntu: sudo apt…

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Linux & Systems Administration

Setting Up an HP Scanner on Linux with HPLIP and SANE
ByEric Ma Aug 22, 2015Apr 12, 2026

Configuring an HP all-in-one printer’s scanner on Linux requires HPLIP (HP Linux Imaging and Printing) for device support and SANE (Scanner Access Now Easy) for scanning functionality. The main gotcha is that a working printer doesn’t guarantee a working scanner — they use different subsystems and need separate configuration. Installing Required Packages Start by installing…

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Linux & Systems Administration

Removing RAID Metadata from Linux Disks
ByEric Ma Aug 15, 2015Apr 12, 2026

When you repurpose disks from one RAID array to another system, Linux keeps the old RAID metadata intact as a safety measure. This prevents accidental data corruption, but it also blocks you from reusing the disk until the signatures are cleared. RAID metadata isn’t stored in one place — it’s scattered across the disk by…

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