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1) **Collect a report of all files in /home/COD/CIT and its subdirectories, including hidden files, with names, sizes, and attributes. Save it as report.txt in the CIT directory.**

2) **Combine report1.txt, report2.txt, and report3.txt into a master file named MasterReport.txt and save it in the /shared directory.**

3) **Append the output "It is a top secret." to the end of /shared/MasterReport.txt.**

4) **Compare the contents of report1.txt and report2.txt, and save the differences in /shared/difference.txt. Append the output to the file.**

5) **Edit the /etc/hosts file using vim.**

6) **In the vim editor, change from command mode to insert mode.**

7) **In the vim editor, change from insert mode back to command mode.**

8) **In the vim editor, save the file and exit vim.**

9) **In the vim editor, exit without saving the file.**

10) **In the vim editor, enter visual mode to highlight multiple lines.**

Answer :

1) The command to collect a report list of all files, including hidden files is `find /home/COD/CIT -type f -exec ls -l {} + > /home/COD/CIT/report.txt`

2) The command `cat report1.txt report2.txt report3.txt > /shared/MasterReport.txt` is used to complete the task.

3) The command to append the output "It is a top secret." is `echo "It is a top secret." >> /shared/MasterReport.txt`.

4) The command to produce the report between the difference for the 2 files and save and append it at /shared/difference.txt is `diff report1.txt report2.txt >> /shared/difference.txt`.

5) To edit the /etc/hosts file using vim, use the command: `sudo vim /etc/hosts`.

6) To change from command mode to insert mode in vim, press the key "i".

7) To change from insert mode back to command mode in vim, press the key "Esc".

8) To save the file and exit vim, while in command mode, press the keys ":wq".

9) To exit vim without saving the file, while in command mode, press the keys ":q!".

10) To enter visual mode and highlight multiple lines in vim, press the key "V".

1) To collect a report list of all files, including hidden files, in the directory and sub-directories under /home/COD/CIT, use the command: `find /home/COD/CIT -type f -exec ls -l {} + > /home/COD/CIT/report.txt`

2) To combine three files (report1.txt, report2.txt, and report3.txt) into a master file named MasterReport.txt and save it in the /shared directory, use the command: `cat report1.txt report2.txt report3.txt > /shared/MasterReport.txt`

3) To append the output "It is a top secret." to the end of the /shared/MasterReport.txt file, use the command: `echo "It is a top secret." >> /shared/MasterReport.txt`

4) To find the difference between the contents of report1.txt and report2.txt and save and append it to /shared/difference.txt, use the command: `diff report1.txt report2.txt >> /shared/difference.txt`

5) To edit the /etc/hosts file using vim, use the command: `sudo vim /etc/hosts`

6) To change from command mode to insert mode in vim, press the key "i".

7) To change from insert mode back to command mode in vim, press the key "Esc".

8) To save the file and exit vim, while in command mode, press the keys ":wq".

9) To exit vim without saving the file, while in command mode, press the keys ":q!".

10) To enter visual mode and highlight multiple lines in vim, press the key "V".

The answers provide a series of Linux commands related to file management and text editing using the vim editor. The commands are described step-by-step to accomplish specific tasks as specified in each question.

In the first paragraph, the summary provides a direct answer to each question, summarizing the necessary command to complete the given task.

The second paragraph elaborates on each command's functionality and how it accomplishes the specified task. This explanation provides a clear understanding of how each command works and what it achieves in the context of file manipulation and text editing using the Linux command-line and the vim editor.

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