Biometrics: The technological and scientific authentication method based on Biology to apply statistical analysis on biological data is called biometrics. It is the science of measurement and statistical analysis of people's unique physical and behavioral characteristics.

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Chapter 4, Problem 5PSA

Program Plan Intro

Biometrics:

The technological and scientific authentication method based on Biology to apply statistical analysis on biological data is called biometrics. It is the science of measurement and statistical analysis of people's unique physical and behavioral characteristics.

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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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