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#unix

3 posts

Shell & TerminalHistory August 26, 2026 3 min read

The History of the Unix Shell: From Thompson Shell to Bash and Zsh

Every shell in daily use today — Bash, Zsh, tcsh, fish — descends from a lineage that started with a genuinely minimal 1971 command interpreter, branching twice into distinct, still-visible family trees.

#history#unix#bash

Haiku OSDeep Dive May 18, 2026 3 min read

Why Haiku Isn't a Unix Clone (and What That Actually Means)

Haiku runs on POSIX-like conventions and supports plenty of Unix software, but underneath that compatibility layer, it isn't descended from Unix at all — its kernel, API, and core assumptions come from somewhere else entirely.

#architecture#haiku#unix

macOSNews March 22, 2026 2 min read

Mac OS X Leopard Becomes an Officially Certified UNIX

On May 18, 2007, Leopard on Intel Macs became the first BSD-based operating system to earn Open Brand UNIX 03 certification — making 'Mac OS X is a real Unix' a certified fact, not just a technical argument.

#news#unix#certification