Posts in Notes

202225 posts

1. 05-03 Linux Basics 25: Wrapping Up — Self-Audit Checklists And Where To Go Deeper
2. 05-02 Linux Basics 24: Boot And Rescue — UEFI, GRUB, initramfs And Emergency Mode
3. 05-01 Linux Basics 23: Containers And Kernel Boundaries — Namespaces, Cgroups And What docker exec Does
4. 04-30 Linux Basics 22: Logs And A Debugging Method — Six Steps From Symptom To Root Cause
5. 04-29 Linux Basics 21: Scheduled Tasks — The Traps Of crontab And systemd Timers
6. 04-28 Linux Basics 20: Shell Scripting, Part Two — trap, Logging, Idempotence And Locking
7. 04-27 Linux Basics 19: Shell Scripting, Part One — Quoting, Tests And Exit Codes
8. 04-26 Linux Basics 18: Performance And Tracing — Where Is The Machine Actually Stuck
9. 04-25 Linux Basics 17: Firewalls — How iptables, nftables, firewalld And ufw Relate
10. 04-24 Linux Basics 16: SELinux — When Every Permission Is Correct And The Service Is Still Denied
11. 04-23 Linux Basics 15: Advanced Permissions — sudoers Wildcards, ACLs And Capabilities
12. 04-22 Linux Basics 14: SSH And Remote Operations — Keys, Permissions And Three Kinds Of Tunnel
13. 04-21 Linux Basics 13: Networking Fundamentals — Troubleshoot From The Bottom Up
14. 04-20 Linux Basics 12: Disks And Filesystems — From Block Device To Mount Point
15. 04-19 Linux Basics 11: systemd — units, systemctl And journalctl Done Properly
16. 04-18 Linux Basics 10: Package Management — What apt Actually Does, And The Four Common Errors
17. 04-17 Linux Basics 09: Users And Groups — passwd, shadow And sudoers
18. 04-16 Linux Basics 08: Environment Variables And Shell Startup Files — Why ssh Cannot Find Your PATH
19. 04-15 Linux Basics 07: Processes And Signals — The Real Difference Between TERM And KILL
20. 04-14 Linux Basics 06: Pipelines And Redirection — Three Streams, One Ordering Trap
21. 04-13 Linux Basics 05: Text Processing — Turning grep/sort/uniq Into Your Analysis Toolkit
22. 04-12 Linux Basics 04: Permissions And Ownership — rwx Is Not The Same On Files And Directories
23. 04-11 Linux Basics 03: The Real Semantics Of ls, cp, mv, rm — And The * That The Shell Expands
24. 04-10 Linux Basics 02: Why / Looks Like This, and What An Inode Really Stores
25. 04-09 Linux Basics 01: Terminals, Shells, and How Commands Are Actually Found