as many people using sdiff in the wrong way, most of people just want the diffrence. if you have only 100 or 200 line it’s fine. what happen if you have 100000 lines compare to 100000 lines.

#FILE_TES1=yourfile.log
#FILE_TES2=yourfile2.log

#sdiff -bBWs $FILE_TES1 $FILE_TES2

this will output only the diffrence