UNIX Shell Scripts Each problem is worth 10%, for a total of 60%. Problem 1 Write a script named isearch to allow users to input a file name and a word/pattern. Search the file for the word/pattern and display the lines that contain the word/pattern on the standard output. If the word/pattern is not found, display a message. indigo 20% isearch Enter the file name: phone_book.txt Enter the word to search for: from Case-sensitive (y/n)? n Nikola Sandic ROB Oxley (647) 209-7932 friend from work (416) 723-8759 friend from university If the word/pattern is not found, display a message. Word 'from' not found. Problem 2 Write a script named icount to allow users to input a file name and display on the standard output the number of lines, words or characters in the file. indigo 21% icount Enter the file name: phone_book.txt Count lines, words, characters or all three (1, m, c, a)? b Invalid option Count lines, words, characters or all three (1, m, c, a)? m File 'phone_book.txt' contains 125 words. Problem 3 Write a script named allfiles to allow a user to list all (ordinary) files in the current directory, one per line, but not the sub-directories in the current directory. (Note: command '1s' displays all files and directories.) indigo 22% allfiles lab3a.c lab3b.c lab3b_out.txt Problem 4 Write a script named fdisplay to allow a user to input a file name and an option to display the content of the file (entire file, entire file one page at a time, first 10 lines, last 10 lines). Display the content of the file as the user specifies. If the user enters an invalid option, display an error message and ask for a correct option. EECS 2031 - Assignment 2 indigo 23% fdisplay Enter the file name: phone_book.txt Enter option (e, p, f, 1): a Invalid option Enter option (e, p, f, 1): p # File is displayed one page at a time Problem 5 Write a script named doublesp to allow a user to input an input and an output file name. Copy the content from the input file to the output file, adding a blank line between every two lines of the input file (double spacing). If the output file exists, display the message shown below. If the user answers yes then append the output to the file. If the user answers no, exit and do nothing (i.e., do not overwrite an existing file). indigo 24% doublesp Enter input file name: phone_book.txt Enter output file name: outfile.txt File 'outfile.txt' exists. Append to it (y/n)? y Problem 6 Write a script named addlines to allow a user to enter an input and an output file name. Copy the content from the input file to the output file, line by line, adding a line number at the beginning of each copied line. Add a space after the colon before copying the line. If the output file exists, display a message as above. If the user answers yes then append the output to the file. If the user answers no, exit and do nothing. indigo 25% addlines Enter input file name: phone_book.txt Enter output file name: outfile.txt indigo 26% cat outfile.txt 1: Ray Szeto (416) 564-6786 friend 2: alex johnson (416) 555-1234 family doctor 3: Tom Podstawka (647) 579-3854 dentist