Using -U 0 makes sense. I don't see why it should be adjusted to -u before that though, that isn't an improvement I don't have strong opinions In any case about hardcoding the -I '^#'. Is there a situation during which end users would would like to see alterations in https://emilianohsydf.blogsumer.com/37608070/the-smart-trick-of-daily-diff-that-no-one-is-discussing