Question

Create the following file and label it credit_cards.txt

Joe                        Smith                    joeytech                             password1          3456-3467-0987-2134

Anne                     Jones                    annieterror                        toesandstuff       4567-3478-2334-8078

Kim                       Stary                     kimother                             password2          9087-2347-4759-9097

Tom                      Nolter                  nolter087                           mypassword       4364-536123-12345

Larry                     Notting                notting198                         password3          123-654-321-9-5

Note that the first three credit cards are the pattern for Visa and MasterCard

grep '[0-9]\{4\}-[0-9]\{4\}-[0-9]\{4\}-[0-9]\{4\}'

The fourth is the pattern for American Express

The fifth is for JCPenney

Create the proper grep statement that when run will only yield that type of credit card.

create the correct grep statements,

show that they get the correct output and

Answer 1

Created a text file credit_cards.txt with the data which you have provided

To get the pattern for Visa and Mastercard as shown in the example-

grep '[0-9]\{4\}-[0-9]\{4\}-[0-9]\{4\}-[0-9]\{4\}' credit_cards.txt

Screenshot for the output-

[0-9] means any digit and \{4\} means to match any preceeding four digits

To get the pattern for the American Express

grep '[0-9]\{4\}-[0-9]\{6\}-[0-9]\{5\}' credit_cards.txt

Screenshot for the output-

[0-9] means any digit and \{4\} means to match any preceeding four digits Similary \{6\} and \{5\} means to match any preceeding six digits and four digits respectively.

To get the pattern for JCPenney

grep '[0-9]\{3\}-[0-9]\{3\}-[0-9]\{3\}-[0-9]\{1\}-[0-9]\{1\}' credit_cards.txt

Screenshot for the output-

[0-9] means any digit and \{3\} means to match any preceeding three digits Similary \{3\} and \{1\} means to match any preceeding three digits and one digit respectively.