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© 2026 Kiet Nguyen

Reference

Linux

Commands grouped by task.

  1. 00

    Introduction to GNU Bash

    What is a shell vs Bash

  2. 01

    Navigation & Paths

    Where am I

  3. 02

    File & Directory Operations

    Create project tree for a service

  4. 03

    View & Inspect Files

    Read logs without opening a full editor

  5. 04

    Permissions & Ownership

    Fix permission denied on deploy user

  6. 05

    Find & Locate

    Find large or recent files on full disk

  7. 06

    Text Processing

    Filter ERROR lines from logs

  8. 07

    Processes & Signals

    Find which one burns CPU/RAM

  9. 08

    systemd Services

    Service not responding — status first

  10. 09

    Journal & Logs

    Last N lines for a unit

  11. 10

    Cron & Timers

    Why cron job silent-failed

  12. 11

    Resources: Disk, Memory, CPU

    Disk full triage

  13. 12

    Networking Basics

    DNS fail vs connection refused vs timeout

  14. 13

    Users, Groups & sudo

    Create service user

  15. 14

    Package Management

    Install / remove / search package

  16. 15

    Archives & Compression

    Tar a directory for handoff

  17. 16

    SSH & Remote Transfer

    Key-based SSH

  18. 17

    Redirection & Shell Glue

    stdout/stderr to file