3. Command Line Editing a. In DUMMY-DIRECTORY there are files named filel txt -file4.txt. Let's rename them to end with dat. The mv instruction (used to rename files) can only rename one file at a time. Enter mv filel.txt filel.dat b. To create an empty file, type touch filename. Let's create the file a file.txt. Use the touch statement. Now, we want to create a new file called b file.dat