Usage: sg_sat_set_features [--count=CO] [--ck_cond] [--extended] [--feature=FEA]
                           [--help] [--lba=LBA] [--len=16|12] [--readonly]
                           [--verbose] [--version] DEVICE
  where:
    --count=CO | -c CO      count field contents (def: 0)
    --ck_cond | -C          set ck_cond field in pass-through (def: 0)
    --extended | -e         enable extended lba values
    --feature=FEA|-f FEA    feature field contents
                            (def: 0 (which is reserved))
    --help | -h             output this usage message
    --lba=LBA | -L LBA      LBA field contents (def: 0)
                            meaning depends on sub-command (feature)
    --len=16|12 | -l 16|12    cdb length: 16 or 12 bytes (def: 16)
    --verbose | -v          increase verbosity
    --readonly | -r         open DEVICE read-only (def: read-write)
                            recommended if DEVICE is ATA disk
    --version | -V          print version string and exit

Sends an ATA SET FEATURES command via a SAT pass through.
Primary feature code is placed in '--feature=FEA' with '--count=CO' and
'--lba=LBA' being auxiliaries for some features.  The arguments CO, FEA
and LBA are decimal unless prefixed by '0x' or have a trailing 'h'.
Example enabling write cache: 'sg_sat_set_feature --feature=2 /dev/sdc'