The programs in this directory are those developed in Chapter 5 of the book.
This chapter introduces a few more advanced concepts of I/O and shows how
to use them by developing implementations of the last lastlog cnd
utmpdump commands. The remaining programs are demonstrations of related parts
of the kernel API.

Their order in the book is as follows.

makefilehole.c
getpwuid_demo.c
showallusers.c
spl_lastlog.c
spl_utmpdump.c
spl_lastlog.c
spl_utmpdump.c
spl_last.c
spl_lastlog.c
