GPG is useful especially for signing commits on GitHub. It is a good idea to pre-emptively make backups of your GPG credentials, as extracting them from an unbootable system drive is not a straightforward process.

Backing up GPG

These steps should work on most, if not all, Linux distributions.

1. First, export your credentials

   gpg --export --export-options backup --output public.gpg
   gpg --export-secret-keys --export-options backup --output private.gpg
   gpg --export-ownertrust >> trust.gpg
   

2. Afterwards, copy these 3 files public.gpg private.gpg trust.gpg to somewhere safe (like an external drive or NAS).

3. You can import them on a new machine by running the following

   gpg --import public.gpg
   gpg --import private.gpg # Prompts you to type the passphrase that you used when you first created the GPG key.
   gpg --import-ownertrust trust.gpg
   

Tip: For GitHub users, if you need to sign commits using your existing GPG key on your new machine, see https://docs.github.com/en/authentication/managing-commit-signature-verification/telling-git-about-your-signing-key.

The GNOME desktop environment for Linux is simple, stable, and user-friendly. However, the maintainers tend to make some bizarre design decisions that reduce its usability. Thankfully it supports third-party extensions like a web browser.

Here are some extensions that I found useful, along with recommended settings. These should be compatible with most popular Linux distributions. ...more

Expansion of the MRT/LRT rail network is a major part of the Singapore Land Transport Master Plan 2040. As the rail network would be over half a century old by then, I wanted to take a look at how its fastest available routes have changed in the past, and how we can expect them to change in the future. So here is a program to calculate the fastest path between any 2 train stations, similar to the countless travel mobile apps out there, but for all known and projected stages, from the initial launch in year 1987 to 2040 and beyond. ...more