This is a script called example. It iterates through the current directory, examining files that match *.* (that is, any file whose name has a period in it) and if that file is readable and writable, it outputs the file name. We see of the directory, files file1.txt, file2.txt, file3.txt and file5.txt, wich ones are readable and writable. The file file4 is not considered because it is not selected with *.*