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

Super ascii string cost, ascii code add=2unit,replace=1unit,delete=3unit.co...

ascii code add=2unit,replace=1unit,delete=3unit.convert ascii code in minimum cost

Control traffic flowing in and out of the network, Firewalls use one or mor...

Firewalls use one or more of three methods to control traffic flowing in and out of the network:  Packet filtering - Packets (small chunks of data) are examined against a s

Illustration of equivalent exe program, Q. Illustration of equivalent EXE p...

Q. Illustration of equivalent EXE program? An illustration of equivalent EXE program for COM program is: ; ABSTRACT this program adds 2 8-bit numbers in the memory locations

What is debate - architecture, What is Debate Debate took place in the ...

What is Debate Debate took place in the 1980s and first half of the 1990s. It was resolved as RISC the winner since it allows more efficient pipelining, results in simpler hard

Input - output devices using device controller, Q. Input - output Devices u...

Q. Input - output Devices using Device Controller? A device controller needs not to necessarily control a single device. It can typically control multiple I/O devices. It come

Define abap/4 layer, Define ABAP/4 layer? The ABAP/4 layer defines the ...

Define ABAP/4 layer? The ABAP/4 layer defines the data formats used by the ABAP/4 processor.

Explain the real time system, What is real time system? A real time sys...

What is real time system? A real time system has well explained, fixed time constraints. Processing must be done within the explained constraints, or the system will fail. It i

Define logical data as operand data type, Q. Define Logical data as operand...

Q. Define Logical data as operand data type? Every word or byte is treated like a single unit of data. Whenever an n-bit data unit is considered as comprising n 1-bit items of

Explain can we have constant volatile variable, Const and volatile keywords...

Const and volatile keywords should not be used together due to both are opposite in nature. A variable is declared as "const" means its value is not able to be altered but if i

Discuss the advantages of store program control, Discuss the advantages of ...

Discuss the advantages of store program control (SPC) automation in telephone switching. Advantages of SPC: (i) Simple to control (ii) Simple to maintain (iii) Fine-

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