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hey whats up guys think white here do technocratic stuff on Twitch on YouTube this is called valid phone numbers and it is a little bit off the beaten path not really data structures and algorithms but good to know a lot of dislikes I dont know what dislikes on this site its free so whats what they hate you know why is everyone disliking everything given a text file filed out text that contains a list of phone numbers one per line write a one-liner bash script to print all valid phone numbers so bash it means command line just command line command so were gonna have a file dot text its gonna have a bunch of phone numbers it might look like this so assume file dot txt has the following content you know heres the phone numbers it might just one phone number four line you may assume that the valid phone number must appear in one of the following two formats so its either a parentheses a space and then three numbers - four numbers or three numbers - for three numbers - four number