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lang-bash
-d '\0'is in fact-d ''asbashcan't pass NUL characters to commands, even its builtins. But it does understand-d ''as meaning delimit on NUL. Note that you need bash 4.4+ for that.'\0', it is$'\0'. And yes, it converts (almost exactly) to''. But that is a way to comunicate to other readers the actual intent of using a NUL delimiter.