[TUHS] Oldest Unix source code still in modern systems

[Jeremy C. Reed]

On Mon, 21 May 2012, Warren Toomey wrote:

> I was doing a trawl of related Unix source trees, and found that some early
> C code from around 2nd Edition Unix is still in OpenSolaris today:
> 
> http://minnie.tuhs.org/cgi-bin/utree.pl?file=V2/cmd/if.c
> 
> Choose: Compare this file to OpenSolaris_b135/cmd/fmli/sys/test.c
> and then click on the Side Scroll or the Printable button.
> 
> There's about 15 lines of code in common between the 2 files.

Cool.  I recently did the same thing for BSD. 
http://www.bsdnewsletter.com/2012/05/Features181.html
Some examples of code that is mostly the same since the first Berkeley 
distribution are: colcrt, expand, mkstr, and soelim. But a few others 
still have some of the original ~1976-1977 code.