Connect To Your Virtual Machine Using SSH And Complete The F

Connect To Your Virtual Machine Using Ssh And Complete The Following T

Connect to your virtual machine using ssh and complete the following tasks. Write a C Shell program that produces a menu driven program with the following six menu choices: (a) allow the user to enter a C Shell command, (b) set the manual entry for a command, (c) show the calendar for a specific month and year, (d) find out what type of information is stored in a file, (e) find the difference between two files, (f) quit the shell script program. The program should continually loop until the user selects to quit. After each option is selected, the user should be able to input the appropriate information to execute the command requested.

Paper For Above instruction

The given assignment requires developing an interactive and menu-driven C Shell script that facilitates various file and system operations, enhancing user productivity and understanding of system commands. This task involves scripting skills, understanding of C Shell syntax, and implementation of user prompts and command executions.

To accomplish these objectives, the script must continually present a menu after performing each selected task, allowing users to perform multiple operations until they choose to terminate the session. This build ensures a seamless user experience and thorough learning of command functionalities.

Introduction

The development of interactive shell scripts provides critical foundational skills for system administrators and advanced users. The specific task involves creating a script that interacts dynamically with users, utilizing fundamental C Shell scripting techniques such as loops, conditionals, and command execution. The script’s design aligns with best practices in scripting by ensuring flexibility, clarity, and user engagement.

Design and Implementation of the Menu-driven Shell Script

The structured implementation requires defining a continual loop that displays a menu with six choices each iteration. The menu options include executing shell commands, consulting manual pages, displaying calendars, inspecting file content types, comparing files, and exiting the script. Essential to this design is robust input handling, ensuring the script correctly interprets user commands and inputs.

1. Command Execution (Option a): This feature prompts the user to input any C Shell command, which the script then executes using the 'eval' command or equivalent execution method. It allows users to run arbitrary commands, enhancing the script's versatility.

2. Manual Entry (Option b): For this choice, the script prompts the user to specify a command for which it displays the corresponding manual page using the 'man' command. It facilitates quick access to command documentation without exiting the script.

3. Calendar Display (Option c): Using the 'cal' command, the script requests the user to enter a month and year, then displays the calendar for that period. This feature underscores the importance of parameterized system commands in scripting.

4. File Content Type Identification (Option d): Here, the script prompts the user for a filename and employs the 'file' command to reveal the type of data stored—such as ASCII text, binary data, or executable. This aids users in understanding file contents efficiently.

5. File Comparison (Option e): The script asks for two filenames and employs the 'diff' command to display differences, supporting version control and file analysis tasks within the script.

6. Exit Option (Option f): Selecting this terminates the loop and ends the script execution, ensuring a controlled and predictable exit strategy.

Script Development Considerations

Developing this script involves using control structures such as 'while' loops for continuous operation and 'case' statements or 'if-else' conditions to handle user inputs. Ensuring proper input validation and error handling prevents runtime errors and unexpected behavior.

The script must be saved with a '.csh' extension and made executable with appropriate permissions ('chmod +x script.csh'). It can be run by executing './script.csh'. The script's design also considers portability and compatibility across different C Shell environments.

Conclusion

The construction of a menu-driven C Shell script accomplishing the outlined tasks demonstrates proficiency in shell scripting, user interaction design, and system command utilization. Such scripts are valuable tools for automating routine tasks, learning system commands, and developing more complex administrative scripts. This project underscores the importance of scripting skills in managing Unix-like systems effectively.

References

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