1) (20 points) Write a Bash shell script named "stars.sh" that Take 1 number as an argument and prints a triangle of asterisks that is left-aligned. For example, if the argument is 4 prints the following: a. b. If there is not exactly 1 argument, or the argument is not an integer, or the integer is less than 1, print an error message and exit Hint: Use for loops c