Bash & Shell Scripting
Complete reference for Bash scripting: syntax, variables, control flow, functions, debugging, and common patterns.
Block Storage & Disk Management
Reference for Linux block storage: partitioning, formatting, mounting, LVM, filesystem operations, and disk debugging.
Common Linux Configuration Locations
Reference for common configuration files and directories across Linux distributions.
Cron Jobs & Scheduled Tasks
Complete reference for scheduling and managing recurring tasks with cron, systemd timers, and at jobs on Linux.
Device Management
Reference for Linux device management: listing devices, inspecting hardware, managing drivers, debugging device issues, and understanding /dev, /sys, and /proc.
Files, Archives & File Editors
Comprehensive reference for Linux file operations: CRUD, searching, archiving with tar, file viewer tools, sed/awk text processing, and Vim editor commands.
Find the Process Listening on a Port
Identify which process is bound to a specific TCP or UDP port on Linux.
Linux Kernel
Reference for working with the Linux kernel: module management, boot parameters, sysctl tuning, GRUB configuration, and kernel debugging.
Linux Networking
Reference for Linux networking: interface configuration, routing, DNS, firewalls (UFW & iptables), diagnostics, and kernel-level network tuning.
Logging & Log Management
Reference for Linux logging: journald, syslog, logrotate, common log locations, and log analysis commands.
Makefile Reference
Complete Makefile reference: syntax, variables, automatic variables, pattern rules, conditionals, functions, and practical patterns for Docker, Kubernetes, Terraform, and general development workflows.
Package Managers
Complete reference for Linux package management: dpkg, APT, nala, package file locations, repository management, and common operations.
Process Management
Reference for Linux process management: listing, monitoring, signaling, priorities, systemd service management, and resource analysis tools.
SELinux
Deep reference for SELinux: DAC vs MAC, security contexts, enforcing/permissive modes, file contexts, booleans, policy modules, port labeling, denial analysis with audit tooling, relabeling, and container volume labels.
Sound & Video Management
Reference for Linux sound and video device management: detecting audio/video hardware, ALSA, PipeWire, PulseAudio, device profiles, Bluetooth audio, monitors, microphones, and webcams.
SSH & Remote Access
Complete reference for SSH: key generation, client configuration, tunneling, agent forwarding, rsync, and common connection patterns.
Users, Groups & Permissions
Reference for Linux user and group management, file permissions, ACLs, sudo configuration, and security frameworks like AppArmor.
Virtual Monitors & Remote Displays
Reference for creating virtual/extra monitors on Linux and driving them from another device over wifi or cable: KDE krfb-virtualmonitor, GNOME Remote Desktop, wayvnc headless outputs, the X11 dummy driver, Deskreen, DisplayLink/evdi, and client-side setup (e.g. using a tablet as a second screen).