Usage: sg_modes [--all] [--control=PC] [--dbd] [--dbout] [--examine]
                [--flexible] [--help] [--hex] [--list] [--llbaa]
                [--maxlen=LEN] [--multiple] [--page=PG[,SPG]] [--raw] [-R]
                [--readwrite] [--six] [--verbose] [--version] [DEVICE]
  where:
    --all|-a        get all mode pages supported by device
                    use twice to get all mode pages and subpages
    --control=PC|-c PC    page control (if not given: 0)
                       0: current, 1: changeable,
                       2: (manufacturer's) defaults, 3: saved
    --dbd|-d        disable block descriptors (DBD field in cdb)
    --dbout|-D      disable block descriptor output
    --examine|-e    examine pages # 0 through to 0x3e, note if found
    --flexible|-f    be flexible, cope with MODE SENSE 6/10 response mixup
    --help|-h       print usage message then exit
    --hex|-H        output full response in hex
                    use twice to output page number and header in hex
    --list|-l       list common page codes for device peripheral type,
                    if no device given then assume disk type
    --llbaa|-L      set Long LBA Accepted (LLBAA field in mode sense (10) cdb)
    --maxlen=LEN|-m LEN    max response length (allocation length in cdb)
                           (def: 0 -> 4096 or 252 (for MODE SENSE 6) bytes)
    --multiple|-M    output multiple page controls rather`than one
    --page=PG|-p PG    page code to fetch (def: 63). May be acronym
    --page=PG,SPG|-p PG,SPG
                       page code and subpage code to fetch (defs: 63,0)
    --raw|-r        output response in binary to stdout
    -R              mode page response to stdout, a byte per line in ASCII
                    hex (same result as '--raw --raw')
    --readwrite|-w    open DEVICE read-write (def: open read-only)
    --six|-6|-s     use MODE SENSE(6), by default uses MODE SENSE(10)
    --verbose|-v    increase verbosity
    --old|-O        use old interface (use as first option)
    --version|-V    output version string then exit

Performs a SCSI MODE SENSE (10 or 6) command. To access and possibly change
mode page fields see the sdparm utility.