You can use diff -T or –initial-tab options to make tabs line up by prepending a tab.
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## Prepend a tab in every line of diff output echo -e "1\t2\n3\n4" > myfile1 ## create some files echo -e "1 2\n5\n4" > myfile2 diff -t myfile1 myfile2 ## expands tab in space ## returns ## 1,2c1,2 ## < 1 2 ## < 3 ## --- ## > 1 2 ## > 5 diff -T myfile1 myfile2 ## prepends tab to everyline ## returns ## 1,2c1,2 ## < 1 2 ## < 3 ## --- ## > 1 2 ## > 5 diff myfile1 myfile2 ## normal output ## returns ## 1,2c1,2 ## < 1 2 ## < 3 ## --- ## > 1 2 ## > 5 |