From mboxrd@z Thu Jan  1 00:00:00 1970
From: reed@reedmedia.net (Jeremy C. Reed)
Date: Fri, 1 Apr 2016 16:00:53 -0500 (CDT)
Subject: [TUHS] Claim your early Unix contributions on GitHub
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On Fri, 1 Apr 2016, Diomidis Spinellis wrote:

> This is the first CSRG fsck SCCS commit.
> 
> Author: Kirk McKusick <mckusick at ucbvax.Berkeley.EDU>
> Date: Thu Aug 27 06:47:37 1981 -0800
> 
> date and time created 81/08/26 23:47:37 by mckusick
> 
> SCCS-vsn: 1.1
> 
> usr/src/sbin/fsck/main.c | 1679

For the earlier code as shipped with BSD see:

4.0 and 4.1  usr/src/cmd/fsck.c
static char *sccsid = "@(#)fsck.c       4.10 (Berkeley) 11/15/80";

The changes document from (January 1980's 3BSD to November 1980's 4BSD) 
calls it the "new ... interactive repair program" and "new, intelligent, 
interactive file system check program" and that it obsoletes dcheck and 
ncheck and largely replaces icheck.

4.1.snap
static  char *sccsid = "@(#)fsck.c      4.13 (Berkeley) 81/03/09";

2.8 (Jun 16  1981 filestamp)
        char    *sccsid = "@(#)fsck.c   2.5";

>From those versions it is easy to see that the later main.c derived from 
the fsck.c. (By the time it gets to the version shipped with 4.3BSD