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Real, dated releases and announcements — verified against official sources, not speculation.
Born August 28, 2009 as a way to get his own team using Zsh, Oh My Zsh grew into the most widely used Zsh configuration framework — with its original robbyrussell theme still recognizable to millions of terminal users today.
Ubuntu 6.10 switched its default /bin/sh from Bash to the much stricter Dash in October 2006, purely for faster boot-time script execution — and immediately surfaced years of accumulated non-portable shell scripts across the ecosystem.
Announced June 4, 2019, the switch from Bash to Zsh as macOS's default shell traced back to a licensing constraint, not a technical judgment about which shell was better — Apple was stuck on an old, GPLv2 Bash version indefinitely.
Released February 13, 2005 by Swedish developer Axel Liljencrantz, Fish chose sensible-by-default behavior and built-in syntax highlighting over POSIX compatibility — a genuinely different bet than Bash or Zsh made.
Announced by maintainer Chet Ramey on February 20, 2009, Bash 4.0 added key-value associative arrays and several other features that had been requested by scripters for years.
Disclosed on September 24, 2014, the Shellshock vulnerability let attackers execute arbitrary commands through a flaw in how Bash processed environment variables — and botnets were scanning for vulnerable systems within hours.
Distributed starting with the second Berkeley Software Distribution in 1979, Bill Joy's C shell introduced features — command history, aliases, filename completion — that nearly every shell since has copied in some form.
Posted to the alt.sources Usenet newsgroup by a Princeton student in 1990, Zsh combined the strongest interactive features of several existing shells — and, decades later, would become the default shell on macOS.
Released as beta version .99 on June 8, 1989, Bash was built for the GNU Project as a genuinely free replacement for the Bourne shell — and would eventually become the default shell on more systems than any of the proprietary shells it set out to replace.
WSL dropped its 'Preview' label in the Microsoft Store on November 22, 2022, decoupling its update cycle from Windows itself entirely — meaning WSL improvements could ship on their own schedule going forward.