Latest blogs
New and familiar pieces land here from time to time for whenever you feel like dipping back into something Linux related.
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How to Run a Command in Shell and Keep It Running After Closing Putty Session: Using Nohup (No Additional Software Needed)
If you’ve ever connected to a remote server via PuTTY, started a long-running command (like a backup script, data processing job, or server…
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How to Run a Command at a Specific Time in a Bash Script Using the `at` Command
In the world of automation, scheduling tasks to run at specific times is a common requirement. Whether you need to trigger a backup, send a…
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RubyMine Error: 'Unable to run gem 'rails'. Cannot find 'rails'' When Creating Rails Application – How to Fix
RubyMine, developed by JetBrains, is a powerful IDE for Ruby on Rails development, loved for its intuitive interface and robust tooling. Ho…
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How to Fix 'activesupport Requires Ruby >=2.2.2' Incompatibility Error with rbenv When Running bundle install
If you’ve ever tried to run `bundle install` on a Ruby or Rails project and encountered the error message: `activesupport requires Ruby ver…
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Ruby on Rails Installation Error: Why '\x89' ASCII-8BIT to UTF-8 Conversion Fails on Linux Explained
Installing Ruby on Rails (RoR) on Linux is generally straightforward, but developers often encounter cryptic errors that halt the process.…
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Ruby on Rails: How to Specify Runner Script Environment – Fix LoadError When Setting RAILS_ENV=production
Ruby on Rails (Rails) is a powerful framework for building web applications, but its utility extends beyond just web requests. The `rails r…
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How to Fix 'no such file to load -- mkmf' Error When Installing RMagick on Ubuntu (Ruby Guide)
If you’re a Ruby developer working on Ubuntu, you may have encountered the frustrating error `no such file to load -- mkmf` when trying to…
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Best Ruby Development Setup for Linux: Top IDEs & Editors (Beyond Vim?) Compared to Mac’s TextMate
Ruby development thrives on a seamless, efficient workflow—and your choice of IDE or editor can make or break productivity. While macOS use…
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How to Fix 'No Such File to Load -- Readline' (LoadError) When Opening Rails Console in Ruby 1.9.2 with Rails 3
If you’ve worked with older Ruby on Rails applications, you may have encountered the frustrating `LoadError: no such file to load -- readli…
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RTNETLINK answers: Operation not supported When Adding IPOIB Interface to Docker Container with Pipework: Fix for Ubuntu 3.19.0-25-generic
InfiniBand over IP (IPOIB) is a critical technology for high-performance computing (HPC) and low-latency networking, enabling InfiniBand ha…
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RTNETLINK answers: No such file or directory: Troubleshooting 'tc qdisc add' Command Issues on Fedora 8 After Kernel Configuration
The `tc` (Traffic Control) utility is a powerful tool in Linux for managing network traffic, enabling Quality of Service (QoS), bandwidth l…
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How to Fix RTNETLINK 'No such file or directory' Error in tc qdisc Commands (netem/htb)
If you’ve ever tried to configure network traffic control (tc) on Linux—whether to simulate network latency with `netem`, shape bandwidth w…
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Is There a Linux Command Line Tool to Download RTMP MP3 Streams? [Complete Guide]
In the age of digital media, streaming has become the primary way we consume audio and video content. However, there are times when you mig…
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RT Preempt vs RTAI vs Xenomai: Differences, Pros & Cons for Real-Time Linux – Measuring CPU TSC with Reduced Jitter for Wifi Frame Timing
In an era where real-time systems power critical applications—from industrial automation and robotics to 5G networks and autonomous vehicle…
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How to Use rsync to Copy Only Specific Folders: Fixing Include/Exclude Pattern Issues
`rsync` is a powerful command-line tool for synchronizing files and directories between local and remote systems. It’s widely used for back…
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Why Rsync Prints 'Skipping Non-Regular File' for What Looks Like a Regular Directory: Causes & Fixes
Rsync is a powerful utility for synchronizing files and directories between local and remote systems. Its efficiency, flexibility, and supp…
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Rsync --chmod Not Setting Group Write Permissions on Destination: Fix for OSX to Debian Transfer
If you’ve ever tried transferring files from an Apple OSX system to a Debian Linux server using `rsync` and encountered issues where group…
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How to Preserve Ownership Only for www-data Files with rsync Over SSH on Ubuntu Servers
When managing web servers, maintaining proper file ownership is critical for security and functionality. The `www-data` user and group are…
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Rsync Not Synchronizing .htaccess? Fix Hidden Files in Root Directory
Rsync is a powerful, widely used tool for synchronizing files and directories between local and remote systems. Its efficiency (via delta t…
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How to Fix Rsync 'mkstemp failed: Permission denied (13)' Error When Using Rsync Daemon for Server-to-Server Backups
Rsync is a powerful utility for efficiently transferring and synchronizing files between servers, making it a go-to tool for server-to-serv…
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Rsync: How to Include Directories But Exclude Files – Backup Directory Structure Without Large Files
Rsync is a powerful command-line tool for file synchronization and backup, beloved by system administrators, developers, and power users fo…
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How to Perform Rsync Checksum Verification: Ensure All Files Are Copied & Retry Until Complete
Rsync is a powerful utility for synchronizing files and directories between local and remote systems. It’s widely used for backups, mirrori…
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Rsync --exclude Not Excluding Specific Files: How to Fix Relative Path Issues in Rsync Commands
Rsync is a powerful utility for synchronizing files and directories between local and remote systems, renowned for its efficiency and flexi…
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Rsync --include Not Working? Fix Bash Script to Copy Only .sh Files (Instead of All Files)
Rsync is a powerful command-line tool for synchronizing files and directories between local and remote systems. Its flexibility makes it a…
Topic collections
Each section is simply a place to wander, scan a few ideas, and return later whenever a thread feels worth following again.
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Bash Scripting
Getting Started with Bash Scripting: A Beginner’s Guide
If you’ve ever worked in a Linux or macOS terminal, you’ve probably used **Bash** (Bourne Again SHell) without realizing it. Bash is the default command-line shell for most Unix-based systems, and it’s more than just a…
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iptables Firewall Tutorial
Getting Started with Iptables Firewall: A Beginner’s Guide
In an era where cyber threats are ubiquitous, securing your Linux system is non-negotiable. A firewall acts as a gatekeeper, controlling incoming and outgoing network traffic based on predefined rules. For Linux users,…
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Linux Basics
Getting Started with Linux: A Beginner’s Guide
If you’ve ever heard tech enthusiasts rave about “Linux” but felt intimidated by its reputation as a “geek-only” operating system, this guide is for you. Linux is not just for programmers or system administrators—it’s a…
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Linux Kernel Basics
Getting Started with Linux Kernel: A Beginner’s Guide
The Linux kernel is the heart of every Linux-based operating system, from smartphones and servers to supercomputers and embedded devices. It acts as the bridge between hardware and software, managing resources like CPU,…
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Linux Performance Tuning
Getting Started with Linux Performance Tuning: A Beginner’s Guide
Linux is renowned for its stability, flexibility, and efficiency, but even the most robust systems can underperform over time. Whether you’re running a personal laptop, a home server, or a production environment, **perf…
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Systemd Service Management
Getting Started with Systemd Service Management: A Beginner’s Guide
If you’ve used a Linux system in the last decade, you’ve almost certainly interacted with **systemd**—the init system and service manager that has become the de facto standard for most Linux distributions (e.g., Ubuntu,…