使用shell获取字符串的问题

Question

我需要获取从linux shell中的文件获取的文件名的长度。这是我的代码：

#!/bin/bash

locate /var/log/orkaudio/ | grep ".wav" | grep -v left | grep -v right > ficherosOrkAudio.txt

while read filePath  ; do

            filePathLenght = ${#filePath}
            echo $filePathLenght
done <ficherosOrkAudio.txt

但是当我运行bash文件时，我得到：

./procesoTest: line 6: filePathLenght: command not found

./procesoTest: line 6: filePathLenght: command not found

./procesoTest: line 6: filePathLenght: command not found

./procesoTest: line 6: filePathLenght: command not found

./procesoTest: line 6: filePathLenght: command not found

./procesoTest: line 6: filePathLenght: command not found

./procesoTest: line 6: filePathLenght: command not found

请帮我解决问题。