#!/bin/bash
Printf ‘please enter the grade out of 20: ’
read inp
Case $inp in
16<Inp<20)
    Echo "very good."
            ;;
14<Inp<16)
     Echo "good."
          ;;
12<Inp<14)
    Echo "good enough."
         ;;
10<Inp<12)
    Echo "average."
         ;;
0<Inp<10)
   Echo "insufficient."
         ;;
esac