$$uestion $2[6$ Points$]$

Write a shell script that manages a to$-$do list. Store the to$-$do list in a file called todo.txt in the format: $(0$ for not started, $1$ for doing, $2$ for complete$).$ The features are as follows:

$./$todolist$.$sh $->$ Print all the tasks in to$-$do list that are not completed

$./$todolist$.$sh display $->$ Print all tasks with their serial numbers

$./$todolist$.$sh add $->$ Add the task in to$-$do list $($in category of not started$)$

$./$todolist$.$sh todo $->$ Print all the tasks not started yet

$./$todolist$.$sh doing $->$ Print all the task whose status is 'doing'

$./$todolist$.$sh complete $->$ Print all completed tasks

$./$todolist$.$sh mark$\_$complete $[1-8$ integers, say n$1..$n$8]->$ Mark as complete all the commands whose serial numbers are n$1,$ n$2,...,$ n$8.$ Note that user may enter any number of serial numbers, upto $8.$

$./$todolist$.$sh delete $[1-8$ integers$]->$ Delete all the tasks whose serial numbers are given as arguments

For any other argument give the appropriate error message.