Part I

Use commands grep, cut, head and tail to write a bash script called selector. It accepts one file and two words as arguments and prints out the portion of the given file between the line of the first appearance of the first word $($this line included$)$ and the line of the first appearance of the second word $($this line included$).$

You can assume that the first occurrence of the first word always appears earlier than the first occurrence of the second word.

Part II

Modify selector to write selector $2.$ It prints out the portion between the line of the second appearance of the first word and the line of the second appearance of the second word.

Use bash if$-$statement and test expression to check if the second appearance of the first word appears after the second appearance of the second word. If so$,$ inform the user about this.

Sample run: