GoKawiil2BSD released with vi editor and C shell additions
Bill Joy expanded the original 1977 Berkeley Software Distribution after user feedback on the Pascal system, adding the vi editor (a visual mode of ex), the C shell, and other tools to create the Second Berkeley Software Distribution, or 2BSD. Early BSD releases were add-on software packages for existing Unix installations rather than standalone operating systems, and required recipients to already hold an AT&T Unix source license.