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Write a client and a server that permit the client to execute arbitrary shell commands on the server host. (If you don't implement any security mechanism in this application, you should ensure that the server is operating under a user account where it can do no damage if invoked by malicious users.) The client should be executed with two command-line argumentAfter connecting to the server, the client sends the given command to the server, and then closes its writing half of the socket using shutdown(), so that the server sees end-of-file. The server should handle each incoming connection in a separate child process (i.e., a concurrent design). For each incoming connection, the server should read the command from the socket (until end-of-file), and then exec a shell to perform the command. Here are a couple hints:
See the implementation of system() in Section 27.7 for an example of how to execute a shell command. By using dup2() to duplicate the socket on standard output and standard error, the execed command will automatically write to the socket.
An anagram is a rearrangement of the letters of a word or phrase into a new word or phrase. Some of them can be quite amusing or apt. For example:
Develop your understanding of the kinds of bizarre problems a system administrator will have to handle. The first part depicts an organization in a bad state. Your job is to devise a scheme to fix it.
Compare B-MAC, Z-MAC and S-MAC for wireless sensor networks.
Define a predicate strike(X,Y,Z) that succeeds if and only if the list Z would be obtained if one were to remove all occurrences of element X from list Y. The strike predicate need not work well when Y is an unbound variable.
The deliverable is a two to three page paper that includes a brief summary of this material, and consideration of the following idea. Is this paper's account of benefits of XBRL similar to the book's.
Build a simple database based on the following instructions and the information covered in module 5. The database should include at least 3 tables that are related, and each of which must have at least 8 attributes
Show how you will go about normalizing it.
Describe how locks could be used in order to qualify data transactions and enhance concurrency control. Suggest at least two business scenarios that would benefit from implementing locking methods.
Assume that the probability of a server failing over night is p = 0.1. If you have 1000 servers, what is the probability that 100 servers will have failed over night?
build the design using a data modeling tool
Circle Class. Write a class name Circle, with the class declaration in a file called Circle.h and the implementation in a file called Circle.cpp. The class will have two data members, a double that holds the radius of the circle and a double called p..
Are there any advantages to physical servers that would preclude someone from usingvirtual machines? At what point do you think the inherent cost savings and manageabilityadvantages that virtual machines provide would outweigh the physical ser..
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