Or:
sdiff -s -w$(tput cols) ${FILE1} ${FILE2}
YMMV...
ET 

Aaron Jones writes: 

> Install and use vimdiff. Its superior in every way.  
> 
> http://vimcasts.org/episodes/comparing-buffers-with-vimdiff/ 
> 
> Or 
> 
> man diff 
> 
> But use vimdiff 
> 
>> On Oct 7, 2017, at 12:16 AM, joe@actionline.com wrote: 
>> 
>> When I try to use 'diff' to compare two htm files,
>> diff shows all lines including all identical lines. 
>> 
>> How can I get diff to show only lines that are different? 
>> 
>>  
>> 
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