/
  bin/
    chmod
    date
    login
    ls
    mkdir
    sh
    tap
  etc/
    as2
    dpd
    getty
    glob
    init
    motd
    mount
    msh
    passwd
    salt
    speak.m
    suftab
    umount
    w2006
  lib/
    c[01]
    crt0.o
    liba.a
    libb.a
    libc.a
  sys/		RK1
    man/
      man?/
    mdec/
      20.o
    nsys/
    sys/
      unix
    tmg/
      tmgl.o
    tmg[abc]
  tmp/
    utmp
    wtmp
  usr/		RK0
    lang/
      bdir/
        ba
        bc
        bilib.a
        brt1
        brt2
      mdir/
        m6a
        m6b
    lib/
      ?
      filib.a
    pub/
      ascii
      kbd
      greek
      tabs
      vsp