TIL

Today I Learned — snippets and quick notes to remind myself.

bash 1 git 1 postgres 1

Multiple GitHub accounts on the same device

git · Jun 29, 2026

Switch account and SSH key automatically per directory, via includeIf and ~/.ssh/config.
Postgres LATERAL join for top-N per group

postgres · Jun 28, 2026

Get the N most recent rows of each group without a window function.
xargs in parallel with -P

bash · Jun 27, 2026

Run a command over many items using all cores.