Count line numbers in files in a folder

#!/bin/bash

verbose=`$( $2 = "-v" )`
verbose=0; [ "$2" == "-v" ] && verbose=1
echo "counting lines in directory: $1 params? $2, verbose: use -v? $verbose"
sum=0
for filename in `find "$1" -type f`
do
        if [ $verbose = 1 ]
        then
                echo " lines in $filename"
        fi
        lineNums="$(wc -l < $filename)"
        sum=`expr $sum + $lineNums`
        if [ $verbose = 1 ]
        then
                echo "file has $lineNums lines, current sum $sum"
        fi

done

echo "total number of lines: $sum"