You can use diff –left-column option to output only the left column of common lines in side-by-side format.
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## Display only the left column of common lines echo -e "1\n2\n3\n4" > myfile1 ## create some files echo -e "1\n2\n3\n6\n5" > myfile2 diff --left-column -y myfile1 myfile2 ## displays left column of common lines ## returns ## 1 ## ( ## 2 ## ( ## 3 ## ( ## 4 ## | 6 ## ## > 5 diff -y myfile1 myfile2 ## without --left-column option ## returns ## 1 ## 1 ## 2 ## 2 ## 3 ## 3 ## 4 ## | 6 ## ## > 5 |