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Unformatted text preview: hell program. Next, the remote shell runs the hello program, and passes the output line back to the telnet server. Finally, the telnet server forwards the output string across the network to the telnet client, which prints the output string on our local terminal. This type of exchange between clients and servers is typical of all network applications. In Chapter 12 we will learn how to build network applications, and apply this knowledge to build a simple Web server. 1.9 Summary
This concludes our initial whirlwind tour of systems. An important idea to take away from this discussion is that a system is more than just hardware. It is a collection of intertwined hardware and software components that must work cooperate in order to achieve the ultimate goal of running application programs. The rest of this book will expand on this theme. Bibliographic Notes
Ritchie has written interesting ﬁrst-hand accounts of the early days of C and Unix [59, 60]. Ritchie and Thompson presented the ﬁrst published account of Unix . Silberschatz and Gavin  provide a comprehensive history of the different ﬂavors of Unix. The GNU (www.gnu.org) and Linux (www.linux.org) Web pages have loads of current and historical information. Unfortunately, the Posix sta...
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