// ...
public Path analyze(String command, Path currentDirectory, Scanner scanner) {
    String[] parts = command.split(" ");
    FileSystemOperations fileSystemOperations = new FileSystemOperations();
    switch (parts[0]) {
        // ...
	case Constants.CATENATE:
	    fileSystemOperations.catenate(parts[1], currentDirectory);
	    break;
	// ...
	default:
	    System.out.println("This command is not supported");
	    break;
    }
    return currentDirectory;
}