Divide 2 numbers

divide.sh

#!/bin/bash

if [ $# -ne 2 ]
  then
    echo "You must enter 2 arguments. You entered $#".
    exit 2
fi

if [ $(echo $1 | grep "[0-9]") ]
  then
    
    if [ $(echo $2 | grep "[0-9]") ]
      then

        if [ $2 -eq 0 ]
          then
            echo "Zero entered for arg 2"
            exit 2
          else
            echo $1 "/" $2 "=" $[$1/$2]
            exit 0
        fi

      else
        echo "The second arg isn't a number."
        exit 2
      fi

  else
    echo "The first arg isn't a number."
    exit 2
fi