Hacker: A hacker denotes a skilled computer expert that uses technical knowledge to overcome a problem. The bugs or exploits are been used by hacker to break into computer systems. The hacker is able to subvert computer security . It mostly denotes computer criminals due to unethical tasks performed. It can be stated as a person who messes about with something with positive sense. Phishing attack: It denotes a fraudulent e-mail sent to retrieve personal data from recipient It is more or less random. The malware may get downloaded to device. It may redirect into fake website to retrieve personal information. The information may be sold in black market for money. Spear phishing attack: The fraudulent e-mails are sent to employee of an organization. The attack is more precise and narrow. The malware may get installed into particular device. It may be targeted to get sensitive company information or voucher money. The task may be targeted to provide harm to a particular organization.

Question

Whentheuserenters!!,themostrecentcommandinthehistoryisexecuted.In the example above, if the user entered the command: Osh> !! The ‘ls -l’ command should be executed and echoed on user’s screen. The command should also be placed in the history buffer as the next command. Whentheuserentersasingle!followedbyanintegerN,theNthcommandin the history is executed. In the example above, if the user entered the command: Osh> ! 3 The ‘ps’ command should be executed and echoed on the user’s screen. The command should also be placed in the history buffer as the next command. Error handling: The program should also manage basic error handling. For example, if there are no commands in the history, entering !! should result in a message “No commands in history.” Also, if there is no command corresponding to the number entered with the single !, the program should output "No such command in history."

Answer 1

Question

Chapter 13, Problem 1PSE

Program Plan Intro

Hacker:

A hacker denotes a skilled computer expert that uses technical knowledge to overcome a problem.

The bugs or exploits are been used by hacker to break into computer systems.

The hacker is able to subvert computer security.

It mostly denotes computer criminals due to unethical tasks performed.

It can be stated as a person who messes about with something with positive sense.

Phishing attack:

It denotes a fraudulent e-mail sent to retrieve personal data from recipient

It is more or less random.

The malware may get downloaded to device.

It may redirect into fake website to retrieve personal information.

The information may be sold in black market for money.

Spear phishing attack:

The fraudulent e-mails are sent to employee of an organization.

The attack is more precise and narrow.

The malware may get installed into particular device.

It may be targeted to get sensitive company information or voucher money.

The task may be targeted to provide harm to a particular organization.

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Whentheuserenters!!,themostrecentcommandinthehistoryisexecuted.In the example above, if the user entered the command: Osh> !! The ‘ls -l’ command should be executed and echoed on user’s screen. The command should also be placed in the history buffer as the next command. Whentheuserentersasingle!followedbyanintegerN,theNthcommandin the history is executed. In the example above, if the user entered the command: Osh> ! 3 The ‘ps’ command should be executed and echoed on the user’s screen. The command should also be placed in the history buffer as the next command. Error handling: The program should also manage basic error handling. For example, if there are no commands in the history, entering !! should result in a message “No commands in history.” Also, if there is no command corresponding to the number entered with the single !, the program should output "No such command in history."

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