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

Signaling pvm process, Q. Signaling PVM process? int pvm_sendsig( ...

Q. Signaling PVM process? int pvm_sendsig( int tid, int signum ) Transmits a signal to other PVM process. tid is task identifier of PVM process to receive signal.

Why do we need dma, Why do we need DMA? DMA is used to transfer the blo...

Why do we need DMA? DMA is used to transfer the block of data directly among an external device and the main memory without the continuous intervention by the processor.

Data validation and data transfer, Data Validation condition: The following...

Data Validation condition: The following condition stated below must be met for a data to be valid as is shown in the figure 3a below. 1. The data on the SDA line must remain stabl

Design issues related to interrupt-driven input - output, Q. Design issues ...

Q. Design issues related to interrupt-driven Input - output? So interrupt handling includes interruption of currently executing program, execution of interrupt servicing progra

Describe website features and functionality, This assignment relates to all...

This assignment relates to all of the course objectives but more specifically to your practical understanding and evaluation of the key issues in relation to the development of the

Convert logic circuit in a binary code, The logic circuit given below, conv...

The logic circuit given below, converts a binary code y 1 y 2 y 3 into Ans. Gray code is X1 = Y1,   X2 = Y1 XOR Y2  ,   X3 = Y1 XOR Y2 XOR Y3 For

Shell script, shell script to find whether the given number is Armstrong or...

shell script to find whether the given number is Armstrong or not

What are the different types of parameters, What are the different types of...

What are the different types of parameters? Formal Parameters: Parameters, which are described during the definition of subroutine with the FORM statement.

Unencoded micro-instructions, Unencoded micro-instructions One bit ...

Unencoded micro-instructions One bit is required for each control signal; so number of bits needed in a micro-instruction is high. It represents a detailed hardware vi

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