sdiff -bBWs file1 file2
-b Ignore changes in the amount of white space
-W Ignore all white space
-B Ignore changes whose lines are all blank
-s Do not output common lines
diff show only differences side by side
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sdiff -bBWs file1 file2
-b Ignore changes in the amount of white space
-W Ignore all white space
-B Ignore changes whose lines are all blank
-s Do not output common lines