How to know line end with space

In some text file or any configuration file might end with space
and to know that below command would be useful.
 cat -E file.txt 

With above command you will know the last character in a line there
is space or not. If there is a space character at end of line then 
you will find space character before dollar sign $ at the end of the line.
For example:
 cat -E file.txt 
 Hello World$                   
 Engine start with a sound $    
 Light is speedier than sound.$ 

Designed by SanjuD(@ngineerbabu)