Answered: Linux 1. Extract phone numbers from…

Computer Networking: A Top-Down Approach (7th Edition)

7th Edition

ISBN:9780133594140

Author:James Kurose, Keith Ross

Publisher:James Kurose, Keith Ross

Chapter1: Computer Networks And The Internet

Section: Chapter Questions

Problem R1RQ: What is the difference between a host and an end system? List several different types of end...

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Linux

1. Extract phone numbers from text file

People write phone numbers in various different formats.

plain 10 digits number: for example, 2128174484
using hyphens to separate the digits: 212-817-4484
enclosing area code with parenthesis, and insert a dash before the extensions: (212)817-4484

Write a script to search all possible telephone numbers in a set of files. You can consider using the -f option of grep family commands to read the patterns from a file.

HINT : All grep options could be in a file called phone.grep

All phone numbers of any format can be in phone.txt

Then, Use command grep -f phone.grep phone.txt to match phone numbers

SOME EXAMPLE GREP PATTERNS

would be (…..not necessarily correct patterns for the problem)

[0-9]\{10\}$[^0-9][0-9]\{10\}[^0-9][^0-9][0-9]\{3\}\-[0-9]\{3\}\-[0-9]\{4\}$[^0-9][0-9]\{3\}\-[0-9]\{3\}\-[0-9]\{4\}[^0-9]

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