Files and folders with names beginning with a dot [.] are hidden or invisible in Linux. They are by default not shown when listing the directory content.
To view the hidden files and folders, simply add the -a (or –all) option to the
ls command, as in the following example;
$ ls file folder $ ls -a . .. file folder .hiddenfile .hiddenfolder
Do note that the command also display the files . and .. . These are files referring to the current and parent directory respectively, and they exist in every single folder in the system.