Plan 9 from Bell Labs’s /usr/web/sources/contrib/yk/lab/unix
--rwxr-xr-x yk sys 748 Mar 26 22:13 dircpu --rwxr-xr-x yk sys 602 Mar 26 22:14 fs --rw-r--r-- yk sys 2051 Mar 27 17:08 guide --rwxr-xr-x yk sys 1265 Mar 26 22:13 x
