Consider the following script and answer the questions: 1 2 8 10 11 12 9012 13 14 15 while getopts "t:" opt; do case ${opt} in t ) target=$OPTARG echo FOO ;; \? ) echo "Invalid option: $OPTARG" 1>&2 ;; : ) esac done echo "Invalid option: $OPTARG requires an argument" 1>&2 ;; shift $((OPTIND -1)) 1) Assume that the scriptname is "myscript". How do you call/run this script in order to display "FOO". 2) Explain how the script works. (explain each line) 3) What is the role of the last command in this script?