Shell Programming

Write UNIX Shell scripts to solve the following programming problems - 1) Write a shell script that calculates GCD (greatest common divisor) of two numbers. • You may take the input numbers from either command line or using standard inputs. • The program must check if the inputs are numbers. 2) Write a shell script to make a CLI based calculator, the program should behave as follows: • The program must start with a clear screen, prompting to input two numbers. 1 • Once given, it must list 5 operations (Add, Sub, Mul, Div, and Mod). • Based on the user’s choice, it should perform addition, subtraction, multiplication, division, and modulus (manage any illegal operation e.g. 0/0). • Once calculated, the result must be printed on a new line and the program must print “Press any key to continue” on the next line. • Pressing any key, the program must go back to the first step. 3) Write a shell script that takes a decimal number as input and prints its binary, octal, and hexadecimal equivalents. • Check if the input is a number. • You may use any inbuild unix tool to perform the conversion. 4) Write a script that takes two filenames and returns the one having more lines than the other. • Filenames must be given with their relative paths. • In case of a tie, the script must return both the filenames. • In case the files are empty or do not exist, the program must print a custom error statement. 5) Write a shell script that creates a CSV file and records the number of packets sent and received by a given network interface ordered by the timestamp. • The interface name and the interval must be provided by the user using a command-line argument. • Please note, a CSV (Comma Seperated Value) file is a text file that stores a table. The first line records the column names and the followig lines record individual rows. Each value seperated by comma (See the example below) name year marks abc 2 86 xyz 1 45 pqr 2 66 • the CSV formation of the given table is, name,year,marks abc,2,86 xyz,1,45 pqr,2,66