What Linux command can you use to make a quick note to store in a file called meeting?

You can use cp command to make a copy of a file. cp <file 1> <file 2> If you want to make a copy of the entire directory then use the recursive option cp -r <dir 1> <dir 2>

mkdir directoryname mkdir "directory name with spaces"

create

That depends entirely on what the file is, and if you have a preferred editor for the job.

The command to set file permissions is "chmod"