#!/bin/bash
# number of arguments must be 3
...
# $2 positive integer  and <= 100 ?
...
# $3 file readable ?
...
shopt -s nocasematch
nday=1
totalcases=0
#=======================
echo "# nday cases totalcases" 
# format :  dateRep day month year cases deaths countriesAndTerritories geoId countryCode pop
# read one line and split it until End of File
while ...
 do
   # continue if country doesn't match $1
    ...
  #  Filtering the noise 
  ...
  # break if nday > $2
   ...     
   ((totalcases=totalcases+cases))
   echo $nday $cases $totalcases
   # increasing nday
   ...
done ...  # read from data file
exit 0