A filename that begins with a period is called an invisible filename (or an invisible file or sometimes a hidden file) because ls does not normally display it. The command ls –a displays all filenames, even invisible ones.
$ls –a
--shows all the files ….
Names of startup files usually begin with a period so that they are invisible and do not clutter a directory listing. The .plan file is also invisible. Two special invisible entries—a single and double period (. and . .)—appear in every directory.
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