Break keys, Computer Engineering

Assignment Help:

Like a normal read, your input should break on the new line character "\n"  and also on the up and down arrow keys. You will process the input made by the user when he/she enters new line.

History

Your shell must keep a history of the last 10 commands executed. When the user presses the up key the current input should show the last command executed (as the user typed it). So if the user executed the "ls" command, then pressed the up key, then pressed enter, the ls command should be executed. When the user presses up multiple times, you should replace the input with the next previous command. Until you reach the end of the history list (max of 10). If the user presses up and reaches the end of the list, the next time up is pressed nothing should happen. Conversely when the down arrow is pressed you should cycle through the history in the other direction. So if

the user presses down without pressing up, nothing should happen. That is because you will be at the bottom of the list. After a command is executed it should be added to the list and the index of where the user is in the history should be reset. This functionality should be similar to how the Bash shell works.


Related Discussions:- Break keys

Explain instruction stream and data stream, Instruction Stream and Data Str...

Instruction Stream and Data Stream The term 'stream' indicates to a series or flow of either instructions or data operated on by computer. In the entire cycle of instruction ex

Explain usenet and newsgroups, Q. Explain Usenet and Newsgroups? In Int...

Q. Explain Usenet and Newsgroups? In Internet there exists another way to meet people and share information. One such way is through Usenet newsgroups. These are special groups

State the concept of multiplicity, Multiplicity Multiplicity in an ass...

Multiplicity Multiplicity in an association specifies tells us about number of objects participate in a relationship. It decides the number of related objects. Multiplicity is

Java Applet, Simple codes for robot using applet

Simple codes for robot using applet

Explain about server synchronization, Q. Explain about Server synchronizati...

Q. Explain about Server synchronization? Server synchronization: It updates atom by server process of requesting process. In this method an atom acts as a unique update server.

What is function scope, What is Function scope Function scope: A labe...

What is Function scope Function scope: A label is the only part of identifier that has function scope. A label is declared implicitly by its use in a statement. Label names m

Number conversion, (a) Convert the following number to single precision IEE...

(a) Convert the following number to single precision IEEE 754 based on the procedure described in class and in the notes. Express the result in hexadecimal. Show all your work.

What is a service in sap terminology, What is a Service in SAP terminology?...

What is a Service in SAP terminology? A service refers to something offered by an s/w component.

How different are interface and abstract class in .net, How different are i...

How different are interface and abstract class in .Net? Abstract classes cannot be instantiated it can have or can't have abstract method basically known as must inherit as th

What is the necessity of interfacing in digital ic, What is the necessity o...

What is the necessity of Interfacing in digital ICs and what are the points to be kept in view, while interfacing between TTL gate and CMOS gate? Ans: To realize the optimum

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd