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how do i write this in shell script ubuntu linux basic directory for this lab you wi 4945741

how do i write this in shell script, ubuntu linux Basic Directory For this lab you will write a basic contacts directory. Eachcontact will be saved in a text file named: username_DAT whereusername is the last name of the contact. The system will print amenu with the following options: New Contact. Search Contact Delete Contact For option 1, the script will ask a user their first and lastname, then the system will do a search for the file namedlastName.dat. If the file is found the system will print “Contact already infile” and exit. If the file is not found the system will ask the user for thefollowing information: Phone Number Email Address Then it will save the information in a file named lastName,datand exit. For Option 2, the system will ask for a last name and use thatvalue to search the file system for a file named lastName.dat. If the file is found the system will print the contents of thefile If the file is not found the system will print “Contact notfound” and exit. For Option 3, the system will ask for a last name and use thatvalue to search the file system for a file named lastName.dat If the file is found, the system will delete the file andexit. If the file is not found the system will print “Contact notfound” and exit. . . .

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