Linux Script

Creating 3 script files Include two pages of scripts plus short summation paragraph, and one page of screenshots. Script 1: Environment Configuration plus File Management Create a C-Shell script program that will read environment variable from a “[login to view URL]” which contains the values of three environment variables as shown below: enVar1 enVar2 enVar3 In your script program, please do the following: Put “#! /bin/csh” in the first line (interpreter line) of the program. Check to see if the [login to view URL] file exists if it does not display an error to the user, and exit the program. Create a loop to read from the [login to view URL], and place each of the lines read into an array element. Create a switch statement within the loop where each case will check what was read from the array in the respective iteration. Within each case, set the environment variable based on the value in the array element that was read from the configuration file. Once the loop has completed, create another loop to echo only the environment variable name, and display to the screen as well as displaying to an output file named “outputFile.txt.” After the final loop has completed, exit the script. Script 2: Creating Functions Create a BASH script program that will demonstrate creating functions in Linux programming. In your script program, please do the following: Put “#!/bin/bash” in the first line (interpreter line) of the program. Define three integer variables named as FirstSum, SecondSum, and Product. Create the first function named “Sum” which will read in two arguments, add the values of two arguments, and then return the sum of these two arguments. Create the second function named “Multiplication” which will read in two arguments, then multiply the values of two arguments, and then return the product of these two arguments. Call function Sum with two arguments as 100 and 200, and assign the result to a variable named FirstSum. Call function Sum with two arguments as 300 and 400, and assign the result to a variable named SecondSum. Call function Multiplication with the values of First Sum and SecondSum. [login to view URL] script. Script 3: Application Process Control Create a C-Shell script program that will demonstrate the use of using sequential, conditional, and iteration to control the application process control. In your script program, please do the following: Put “#! /bin/csh” in the first line (interpreter line) of the program Declare an integer variable to hold user input. To begin sequentially, output to the screen prompting the user to enter a number. Accept the user input, and assign it to the integer variable that you declared. Create an if condition statement checking the number that was input to see if it is less than 100. If the number is less than 100, output to the screen that the number is less than 100. If the number is equal to 100, output to the screen that the number is equal to 100. If the number is greater than 100, output to the screen that the number is greater than 100. Create a while loop to reduce the variable value that the user input to 0, and in each iteration output to the screen the value of the variable. Be creative and output anything else that you would like here. Once the while loop is complete and prior to the end of your program, output to the screen that "the script has ended and goodbye." Exit the script.