Unix/Lunix Programming Exercise 7 In your CWD, make a text file called phone_num

Question

Unix/Lunix Programming

Exercise 7

In your CWD, make a text file called phone_number.txt that contains at least the following lines.

123 456-7891

123-456-78912

(123)-456-7890

123 456 7890

219-123-4567

(405) 456-7890

Exercise 8

Assume that a valid phone number has the format xxx-xxx-xxxx and each line in the text file does not contain leading or trailing white spaces.

Write a grep command that prints all valid phone numbers in phone_number.txt

Exercise 9

Now Assume that a valid phone number has the format (xxx) xxx-xxxx and each line in the text file does not contain leading or trailing white spaces.

Write a grep command that prints all valid phone numbers in phone_number.txt

Exercise 10

Now Assume that a valid phone number can have either the format xxx-xxx-xxxx or the format (xxx) xxx-xxxx.

Write a grep command that prints all valid phone numbers in phone_number.txt

Explanation / Answer

Exercise8- Answer:

  xxx-xxx-xxxx :

Exercise9- Answer:

(xxx) xxx-xxxx : (space between (xxx) and xxx-xxxx)

Exercise10- Answer:

xxx-xxx-xxxx or (xxx) xxx-xxxx

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