In UNIX

Write a command to:

count the number of files in a directory (but not including the . and .. files)

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Write a regular expression to match all user email addresses but limited to only the domains of .com, .net, .edu.

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Devise a sequence to display the extensions of all files in the current directory along with a count of each extension. Your command must be a single command line using a series of pipe operations and no temporary data files