Thirty-five years ago, a Finnish graduate student named Linus Torvalds posted a short note saying he was starting work on a free operating system as a hobby. Both Tom's Hardware and ZDNet marked the anniversary of that announcement this week — and both noted how thoroughly Torvalds undersold what he was building.
According to ZDNet, Torvalds framed the project as "just a hobby" that "won't be big." The publication also notes he came close to giving it an entirely different name: Freax, rather than Linux.
The scale of what followed is easier to grasp in numbers. Tom's Hardware reports that Linux began life at roughly 10,000 lines of code — small enough for one person to hold in their head — and has since grown to around 40 million lines. That growth tracks the shift from a student's side project to what Tom's Hardware describes as software that now dominates global infrastructure.
That dominance is largely invisible to ordinary users, which is part of why the anniversary is worth noting. Most people never see a Linux prompt, but the systems they rely on quietly run on it.
The story also stands as an unusually clean case study in how open, collaborative software development compounds over decades. Nothing about a 1991 hobby announcement suggested an outcome of this scale; the gap between Torvalds' modest framing and the eventual reach of the project is the whole point.
Why it matters: a free project one student expected to go nowhere now underpins much of the computing world, a reminder that the most consequential technology often arrives without any announcement that sounds important.