Exercise 1 : Write a shell script that displays the contents of the directories existing in a directory given as argument (use the for loop) Exercice 2: Write a shell script that displays the contents of subdirectories of the directories that are given as arguments. The script should be called with any number of parameters. Exercice 3: Write a shell script that displays the nth line of a file(you can use head and tail). The integer n and the input file name are given by the user in response to the request of the script (use the command read). Try to do all possible tests (file exists or not etc ...) Exercise 4: Write a shell script that allows you to rename a series of files. Read the name of the file, if it exists and not empty, you give the new name. Rename the file and loop through a new reading. Otherwise you view an error message and the program will exit.| Exercise 5: Write a shell script that displays the contents of files given as a parameter. A confirmation request is displayed before each file