Plan 9 from User Space /usr/local/plan9/src/cmd/diff

--rw-r--r-- M 0  glenda sys  817 Mar 23 20:59 diff.h
--rw-r--r-- M 0  glenda sys 1900 Mar 23 20:59 diffdir.c
--rw-r--r-- M 0  glenda sys 6618 Mar 23 20:59 diffio.c
--rw-r--r-- M 0  glenda sys 8861 Mar 23 20:59 diffreg.c
--rw-r--r-- M 0  glenda sys 4443 Mar 23 20:59 main.c
--rw-r--r-- M 0  glenda sys  121 Mar 23 20:59 mkfile