https://lichtung.pages.dev/ Notes and gleanings. https://lichtung.pages.dev/journalctl-k/ https://lichtung.pages.dev/journalctl-k/ Thu, 04 Jun 2026 00:00:00 +0000 journalctl -k implies -b, so a --since window over kernel logs silently shows only the current boot. https://lichtung.pages.dev/nsw-fold/ https://lichtung.pages.dev/nsw-fold/ Thu, 04 Jun 2026 00:00:00 +0000 The same expression optimizes to a constant for signed ints and to real work for unsigned — because signed overflow is undefined, and one IR flag says so. https://lichtung.pages.dev/d-get-or/ https://lichtung.pages.dev/d-get-or/ Wed, 03 Jun 2026 00:00:00 +0000 The two forms answer different questions; "or default" fires on every falsy stored value, not on a missing key. https://lichtung.pages.dev/bash-init/ https://lichtung.pages.dev/bash-init/ Tue, 02 Jun 2026 00:00:00 +0000 Login, interactive, and non-interactive bash each read different startup files — and ssh host cmd reads almost none of them. https://lichtung.pages.dev/is-none-nan/ https://lichtung.pages.dev/is-none-nan/ Mon, 01 Jun 2026 00:00:00 +0000 In Python use is for the singletons and == for values — and remember that NaN never compares equal to itself.