Could we make it so this file is testable the same way the last was?
Could you change ^.*length to "Accepts a single literal byte"?
It would be better if this was two sentences - ". If zero,".
I don't know if this should be noted in the man page but this diagnostic output is intended to be machine readable to make scripting easier. I've found dd(1p) to be not only needlessly verbose but also a pain in the ass in this regard.
Though this output prioritizes human readability it was also meant to be machine readable in case that was necessary. I couldn't imagine why and I hope it never would be, but if it is, it's easy.
"Permits adjacent integers to be equal to each other" is sufficient to describe the full functionality.
Whether or not the input is a stream is irrelevant to the function of the option -S.
While that is true, nul with a single L is used to refer to an eight-bit (theoretically, maybe even a seven-bit) zero value given in text encoding. Null with two Ls is often used to refer to the…