***WORK MUST BE ORIGINAL******WORK MUST BE ORIGINAL******WORK MUST BE ORIGINAL***Instructions This project incorporates many skills learned throughout this course. Prepare the shell program described below using a modular approach that uses functions where appropriate.First, identify the password file attached to this project, the one used in assignment 5, or create your own as desired. It will be used in this project. Make sure it at least has your own logname username of yourself in the file.Second, create an office telephone directory file containing three columns of the last name, first name, and phone number of at least 10 individuals. Then create a shell program that accepts either one (last name) or two (last name and first name) arguments. Check to ensure that one or two arguments are on the command line. If there is only one argument, display a message informing the user that more than one entry might be returned from the phone book. Exit the program if there are less than one or more than two arguments.Third, after checking on the arguments, display a prompt asking what phone book directory file to search. Test to ensure that the entry is a valid regular file that is not zero bytes in length. If not a regular file, exit the program with an appropriate message to the user on the screen. Then check to see that there are three columns in the file. If there are not three columns, display a message indicating that the file does not contain a configuration consistent with a phone book and exit the program with an appropriate message displayed on the screen.Fourth, display a menu in the shell program that allows adding (A) an entry to the phone book, deleting (D) an entry from the phone book, modifying (M) an entry in the phone book, displaying (I) an entry in the phone book, displaying (P) all entries in the phone book in sorted order, or exiting (X) the program. Accept either an uppercase or lowercase letter for the menu option. For adding, deleting, or modifying an entry, add additional code that checks the logname of the user running the shell program and ensures that the user is a member of the class (in the /etc/passwd personally created password file). For security reasons, you may need to use the passwd file included as an attachment in the assignment or us
e your own. This program continues until the exit choice is entered. Other General Requirements:In addition to including the above-mentioned functionality, make sure you incorporate each of the following elements in order to receive full credit:1. Inclusion of a trap statement at the top of the program and testing to ensure that it works.2. Completely functional business logic for each of the menu options (i.e., adding, deleting, modifying, displaying).3. Use of functions throughout- such as for each menu option4. Use of Linux commands: sed and conditional statements (e.g, if and do or while)5. Upload of both the actual shell program code and three or more screenshots illustrating the functionality of the menu options Grading Rubric CriterionPoint Value (%)Below Average (0% of value)Average (50% to 70% of value)Above Average (80% to 90% of value)Superior (90% to 100% of value)Input parameter validation10NoneOnly number args or file checkedIncomplete checking of arguments and fileNumber args and file size and format checkedInput file complete5NoneInput file exists w/less than 10 entriesInput file exists w/less than 20 entriesInput file exists with 20+ entries properly formattedTrap included5NoneNoneTrap statement coded but not demoedTrap statement coded and demoedMenu included10NonePartial list (1-3) of menu items coded and displayedAll menu items coded and displayed with cosmetic issuesAll menu items coded and displayed in user-friendly manner. Lower- and upper-case inputs accepted.Business logic complete20None1 or 2 functions partially complete and working (display, add,modify, delete)1 or 2 functions complete (display, add,modify, delete)4 functions (Display, add, modify, delete) complete and workingLinux command usage20NoneLimited use of functions, but no usage of sed or conditional statementsGood use of functions, but limited usage of conditional statementsComplete use of 1) functions, 2) sed, 3) if and do/while conditional statementsOutput complete15NoneCode included, 0-1 screenshotsCode included, 2 screenshots3 or more screenshots, code includedWriting quality15NoneMajor English faults, poor labellingClear English, few faults, partial commenting,good labellingFully commented code, labelled screenshots, clear English, and no faultsTotal100