Linux
How to Open a Specific Port on Ubuntu with UFW
Jason Yang · 03 Dec, 2025
Safely open a specific port on Ubuntu with UFW: check status, enable the firewall without losing SSH access, and verify your rules — step by step.
Blog posts — page 34
Tools
How to Back Up and Restore SecureCRT Settings on Ubuntu
Jason Yang · 03 Dec, 2025
Back up and restore your full SecureCRT configuration on Ubuntu with simple terminal commands so you never lose saved sessions when migrating or reinstalling.
Coding Interview
Divide and Conquer (D&C): Beyond Merge Sort
Jason Yang · 03 Dec, 2025
Divide and Conquer is more than Merge Sort: the 3-step design paradigm, how it differs from plain recursion, and the interview patterns that use it.
![[Synology] How to Enable SSH and Log in as Root](/images/covers/synology_nas_ds916--thumb.webp)
Homelab
[Synology] How to Enable SSH and Log in as Root
Jason Yang · 02 Dec, 2025
Enable SSH on Synology NAS and log in as root using 'sudo -i'. A quick guide for advanced DSM administration and secure terminal access.
Tools
[SecureCRT] How to Set Up a Serial Console Connection
Jason Yang · 02 Dec, 2025
Set up a serial console connection in SecureCRT to HP servers (DL380/DL580, HP-UX) — the exact baud rate, data bits, parity, and flow-control settings.