Use the chmod command to change permissions of the project_m.txt file so that the group doesn’t have read or write permissions.

Sure, here are the steps to change the permissions of the file project_m.txt using the chmod command:

1. Open a terminal: You can do this by searching for "terminal" in your computer's search bar and clicking on the terminal application.

2. Navigate to the directory containing the file: Use the cd command followed by the path of the directory. For example, if your file is in the Documents directory, you would type cd Documents.

3. Change the permissions of the file: Use the chmod command followed by the permissions you want to set, and then the name of the file. In this case, you want to remove read and write permissions for the group. The command would be chmod g-rw project_m.txt.

Here's what each part of the command means:

• chmod is the command used to change the permissions of a file.
• g stands for "group".
• - means "remove the following permissions".
• rw stands for "read and write permissions".
• project_m.txt is the name of the file.

So, the full command chmod g-rw project_m.txt means "change the permissions of the file project_m.txt to remove read and write permissions for the group".

After running this command, the group will no longer have read or write permissions for the file project_m.txt.