The original source code of the vi text editor, taken from System V

• vi

  3 137 10.0 C

  The original source code of the vi text editor, taken from System V

This code implements the most important feature of the editor in question: https://github.com/Cube9999/vi/blob/master/vax/ex_cmds.c#L45...

• unix-history-repo

  51 6,434 0.0 Assembly

  Continuous Unix commit history from 1970 until today

This is what it looked like about 7-8 years earlier: https://github.com/dspinellis/unix-history-repo/blob/BSD-1/e...

• WorkOS

  workos.com sponsored

  The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.

  

• unix-history-man

  2 25 0.0 Perl

  Manual page availability across major Unix releases

Indeed, the History of Documented Unix Facilities [https://github.com/dspinellis/unix-history-man] says a vi(1) man page first appeared in 2BSD, and vi is implemented (as part of ex, with a 1979 copyright) in 2BSD src/ex, with the main routines at src/ex/ex_vmain.c: https://github.com/dspinellis/unix-history-repo/blob/BSD-2-S...

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