-APUE-:
fig8.1, example of fork function.
fig8.3, example of vfork function.
fig8.6, demonstrate various exit status.
fig8.8, avoid zombie processes by calling fork twice.
fig8.12, program with a race condition.
fig8.13, modification of fig8.12 to avoid race condition.
tellwait3, modification of fig8.13 of different output order.
fig8.16, example of exec function.
fig8.17, echo all command-line arguments and all envions.
fig8.20, program execs an interpreter file.
fig8.21, an awk program as an interpreter file.