I once saw a talk from Brian Kernighan who made a joke about how in three weeks Ken Thompson wrote a text editor, the B compiler, and the skeleton for managing input/output files, which turned out to be UNIX. The joke was that nowadays we're a bit less efficient :-D
Otoh: I got react to run my tests without any warnings today.
If I write a bunch of tests for new code, and all of them pass on the first attempt, I'm immediately suspicious of a far more egregious bug hiding somewhere…
/bin/true used to be an empty file. On my desktop here, it's 35K (not counting shared libraries), which is an asolute increase of 35K and a relative increase of ∞%.