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

Manipulating numbers, Computers manipulate numbers - but decimalnumbers wit...

Computers manipulate numbers - but decimalnumbers with digits 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 cannot be represented using two states of a digitalcircuit.Instead decimal numbers are co

What is c++ reference and java final, What is C++ reference and JAVA final?...

What is C++ reference and JAVA final? Association ends must be bound at initialization and cannot be altered. C++ references can fully enforce these semantics, and the JAVA fin

Determine frequency of a dtmf phone, In a DTMF phone a dialling of 8 genera...

In a DTMF phone a dialling of 8 generates (A) 1336 Hz- 770 Hz                      (B)  1209 Hz - 1477 Hz (C)  1209 Hz- 941 Hz                     (D)  1336 Hz-852 Hz

When can a user program execution be interrupted, When can a user program e...

When can a user program execution be interrupted? It won't be desirable to interrupt a program when an instruction is being executed and is in a state such as instruction decod

Difference between shadow and override in programming, Overriding tell us o...

Overriding tell us only the methods, but shadowing tells us the entire element.

Explain about joint application development, Q. Explain about Joint Applica...

Q. Explain about Joint Application Development? It is defined as a structured approach in which users, managers, and analysts work together for many days in a series of intensi

Hardware implementation for signed-magnitude data, Hardware Implementation ...

Hardware Implementation for signed-magnitude data When multiplication  is  implemented  in  digital  computer,  we  change  process lightly. Here, in place of providing registe

Explain about api s of olap, Microsoft in the late 1997 introduced a standa...

Microsoft in the late 1997 introduced a standard API called as OLE DB. After which XML was used for analysis specification and this specification was largely used by a lot of vendo

Importance of using module-instance parameter, Using Module-Instance Parame...

Using Module-Instance Parameter: Parameter values can be overridden while a module is instantiated. New parameter values are passed at the time of module instantiation. Top-

Find the width of a time division space switch, I n a time division space s...

I n a time division space switch the size of the control memory is N and its Width:  (A) Log 10 M  (B) Log e M  (C) Log N M  (D) Log 2 M Where N are the ou

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