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The wording of the dd --help text suggests that output will be skipped for sparse *input* blocks (i.e. that NUL-checking is done on input blocks) while the code actually checks/skips all-NUL *output* blocks.[1] * src/dd.c (usage): Update the --help text to clarify the above. * tests/dd/sparse.sh: Ensure sparseness is controlled with obs. [1]: https://superuser.com/a/1136358