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.

Posted Date: 4/3/2013 2:58:56 AM | Location : United States

Ask an Expert

Related Discussions:- Break keys, Assignment Help, Ask Question on Break keys, Get Answer, Expert's Help, Break keys Discussions

Write discussion on Break keys
Your posts are moderated

Write your message here..

Related Questions

What is non-repudiation, What is non-repudiation? Non Repudiation: Assu... What is non-repudiation? Non Repudiation: Assurance that the sender is given with proof of delivery and that the recipient is provided with proof of the sender's identity so th

What is a lambda expression, A Lambda expression is not anything but an Ano... A Lambda expression is not anything but an Anonymous Function, can have expressions and statements. Lambda expressions can be used mostly to make delegates or expression tree types

Explain about distributed shared memory systems, Explain about Distributed ... Explain about Distributed Shared Memory Systems? Distributed Shared Memory (DSM) systems emulate a shared memory abstraction on loosely coupled architectures in order to allow

Contact-based keyboards, Contact-based keyboards employ switches directly. ... Contact-based keyboards employ switches directly. Though they have a comparatively shorter life they are the most preferred type these days because of their lower cost.  Three such

What is enctype, ENCTYPE="application/x-www-form-urlencoded" and in its pl... ENCTYPE="application/x-www-form-urlencoded" and in its place use ENCTYPE="text/plain". The subsequent illustration displays a general form which includes some of the commo

Define mfc, Define MFC. To accommodate the variability in response time... Define MFC. To accommodate the variability in response time, the processor waits unless it receives an indication that the requested read operation has been done. The control s

What do you mean by execution unit, Q. What do you mean by Execution Unit? ... Q. What do you mean by Execution Unit? Execution unit performs all ALU operations. Execution unit of 8086 is of 16 bits. It also contains the control unit that instructs bus in

Transformation – the process of change, TRANSFORMATION - THE PROCESS OF CHA... TRANSFORMATION - THE PROCESS OF CHANGE Much of contemporary art and design practice and indeed popular culture is dedicated to looking at how change affects us as individuals a

Why isdn handles data pertaining, ISDN handles data pertaining to? ISDN... ISDN handles data pertaining to? ISDN handles data pertaining to all digital services.

Which interface controls what is shown on the p.c., Which interface control... Which interface controls what is shown on the p.c.? Presentation Interface  controls what is shown on the p.c