simple script to tally the numbers in a defined column of text

Sample input file..
row1 1 2 3 4 5 6 7 8 9
row2 2 3 4 5 6 7 8 9 10
row3 1 2 3 4 5 6 7 8 9
row4 1 2 3 4 5 6 7 8 9
row5 1 2 3 4 5 6 7 8 9
row6 1 2 3 4 5 6 7 8 9
row7 1 2 3 4 5 6 7 8 9
row8 1 2 3 4 5 6 7 8 9
row9 1 2 3 4 5 6 7 8 9
row10 1 2 3 4 5 6 7 8 9

Sample outputs
./column-tally.sh -f input -c second -v ON
input is readable
Column is second
row1    1       1
row2    2       3
row3    1       4
row4    1       5
row5    1       6
row6    1       7
row7    1       8
row8    1       9
row9    1       10
row10   1       11
The cumulative value of the second column is 11

./column-tally.sh -f input -c tenth -v ON
input is readable
Column is tenth
row1    9       9
row2    10      19
row3    9       28
row4    9       37
row5    9       46
row6    9       55
row7    9       64
row8    9       73
row9    9       82
row10   9       91
The cumulative value of the tenth column is 91

---

#!/bin/bash


usage()
    {
    cat << EOF
usage: $0 -f input.txt -c first second
       $0 -f input.txt -c first second -v ON

This script will tally the numerical values in the specified column.

OPTIONS:
   -f      input file
   -c      column number  {first,second....tenth)etc..
   -v      verbosity {ON}

EOF
    }


if [ $# -lt 4 ]
then
  usage
  exit 1
fi




while getopts ":f:c:v:" opt; do
  case $opt in
    f)
      InPutFile=$OPTARG
        if [ -r "$InPutFile" ]
         then
         echo "$InPutFile is readable"
         else
         echo "Unable to read input file --> $InPutFile !!!"
         usage
         exit 1
        fi
      ;;
    v)
      Verbose=$OPTARG
       ;;
    c)
      echo "Column is $OPTARG"
      Column=$OPTARG
        if [[ $Column == "first" ||  $Column == 'second' || $Column == 'third' || $Column == 'fourth' || $Column == 'fifth' || $Column == 'sixth' || $Column == 'seventh' || $Column == 'eighth' || $Column == 'ninth' || $Column == 'tenth' ]]
         then
           true
         else
          echo" not a valid column value"
          echo" must be either: first second third fourth fifth sixth seventh eighth ninth tenth"
          usage
          exit 1
        fi  
      ;;
    :)
      echo "Option -$OPTARG requires an argument." >&2
      usage
      exit 1
      ;;
    ?)
      echo "Invalid option: -$OPTARG" >&2
      usage
      exit 1
      ;;
    *  )
      echo "Unimplemented option: -$OPTARG" >&2
      usage
      exit 1
      ;;
  esac
done

cumulative=0
 while read -r first second third fourth fifth sixth seventh eighth ninth tenth; do
let " cumulative += Column "
let " value = Column "
  if [[ $Verbose == 'ON' || $Verbose == 'OFF' ]]
     then
       true
     else
       echo "invalid Verbosity setting please use -v ON   or -v OFF"
       exit 1
  fi
  if [ $Verbose == 'ON' ]
    then
   echo -e "$first \t$value \t$cumulative"
    else
   true
  fi
done < $InPutFile
echo "The cumulative value of the $Column column is $cumulative"