valid phone number - saviovettoor/DevOps-wiki GitHub Wiki

#!/usr/bin/env bash
#Given a text file file.txt that contains list of phone numbers (one per line), write a one liner bash script to print all valid phone numbers.
#
#You may assume that a valid phone number must appear in one of the following two formats: (xxx) xxx-xxxx or xxx-xxx-xxxx. (x means a digit)
#
#You may also assume each line in the text file must not contain leading or trailing white spaces.
#
#Example:
#
#Assume that file.txt has the following content:
#
#987-123-4567
#123 456 7890
#(123) 456-7890
#Your script should output the following valid phone numbers:
#987-123-4567
#(123) 456-7890

file_name=$1
grep -E '(^\([0-9]{3}\) [0-9]{3}-[0-9]{4}$)|(^[0-9]{3}\-[0-9]{3}\-[0-9]{4}$)' $file_name