ch01
....\bookcode
....\........\Makefile
....\........\more01.c
....\........\more02.c
ch02
....\bookcode
....\........\Makefile
....\........\cp1.c
....\........\utmplib.c
....\........\who0.c
....\........\who1.c
....\........\who1bot.c
....\........\who1top.c
....\........\who2.c
....\........\who3.c
....\........\who3top.c
ch03
....\bookcode
....\........\Makefile
....\........\fileinfo.c
....\........\filesize.c
....\........\ls1.c
....\........\ls2.c
ch04
....\bookcode
....\........\Makefile
....\........\spwd.c