/usr/share/zfs/zfs-tests/bin/stride_dd: invalid option -- '-'
Unrecognized option: --
usage: /usr/share/zfs/zfs-tests/bin/stride_dd -i inputfile -o outputfile -b blocksize [-c count]
           [-s stride] [-k seekblocks] [-K seekbytes]
           [-a alignment] [-d if_o_direct] [-D of_o_direct]
           [-p skipblocks] [-P skipbytes] [-e entire_file]

Simplified version of dd that supports the stride option.
A stride of n means that for each block written, n - 1 blocks
are skipped in both the input and output file. A stride of 1
means that blocks are read and written consecutively.
All numeric parameters must be integers.

    inputfile:   File to read from
    outputfile:  File to write to
    blocksize:   Size of each block to read/write
    count:       Number of blocks to read/write (Required unless -e is used)
    stride:      Read/write a block then skip (stride - 1) blocks
    seekblocks:  Number of blocks to skip at start of output
    seekbytes:   Treat seekblocks as byte count
    alignment:   Alignment passed to posix_memalign() (default PAGE_SIZE)
    if_o_direct: Use O_DIRECT with inputfile (default no O_DIRECT)
    of_o_direct: Use O_DIRECT with outputfile (default no  O_DIRECT)
    skipblocks:  Number of blocks to skip at start of input  (default 0)
    skipbytes:   Treat skipblocks as byte count
    entire_file: When used the entire inputfile will be read and count will be ignored