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Notes: Small seeks are not coalesced to larger ones, like is done in cache_round() for example. conv= is used rather then oflag= for FreeBSD compatibility. * src/dd.c (final_op_was_seek): A new global boolean to flag whether the final "write" was converted to a seek. (usage): Describe the new conf=sparse option. (iwrite): Convert a write of a NUL block to a seek if requested. (do_copy): Initialize the output buffer to have a sentinel, to allow for efficient testing for NUL output blocks. If the last block in the file was converted to a seek, then convert back to a write so the size is updated. * NEWS: Mention the new feature. * tests/dd/sparse: A new test for the feature. * tests/Makefile.am: Reference the new test.