UnixAn influential multitasking OS from the 1970s — files, pipes, and C shaped Linux, macOS, and BSD. combined a simple kernelThe core of an operating system that manages hardware, memory, and processes — everything else depends on it., hierarchical file system, and pipe-based tools into an environment designed for programmers. Thompson and Ritchie rewrote it in C on the PDP-11, then AT&T licensed it to universities — spawning BSDBerkeley Software Distribution — a family of Unix-like operating systems originating from UC Berkeley., Linux, macOSApple's desktop operating system — runs on Mac hardware with Unix foundations and the Cocoa UI framework., and AndroidGoogle's open mobile operating system — the dominant platform for smartphones worldwide. across every server and smartphone today.

UnixAn influential multitasking OS from the 1970s — files, pipes, and C shaped Linux, macOS, and BSD. defined the portable, multi-user OSOperating system — software that manages hardware and provides services to applications. model that still runs most of the internet.

Files, pipes, and C on UnixAn influential multitasking OS from the 1970s — files, pipes, and C shaped Linux, macOS, and BSD. became the blueprint for modern operating systems.