These are the Linux command questions

2. What permissions are needed for an owner to be able to change the name of a directory? Hint: you can make a guess and verify your hypothesis in Ubuntu.
3. What is the difference between command ls a and command ls l?
4. What does command chmod 754 file_a mean? Write down the text counterpart of the command.
5. Write down the command to find all the files with jpg extension in your home directory.