Usage: sg_read_attr [--cache] [--element=EA] [--enumerate] [--filter=FL]
                    [--first=FAI] [--help] [--hex] [--in=FN] [--lvn=LVN]
                    [--maxlen=LEN] [--partition=PN] [--quiet] [--raw]
                    [--readonly] [--sa=SA] [--verbose] [--version]
                    DEVICE
  where:
    --cache|-c         set CACHE bit in cdn (def: clear)
    --enumerate|-e     enumerate known attributes and service actions
    --element=EA|-E EA    EA is placed in 'element address' field in
                          cdb [SMC-3] (def: 0)
    --filter=FL|-f FL    FL is parameter code to match (def: -1 -> all)
    --first=FAI|-F FAI    FAI is placed in 'first attribute identifier'
                          field in cdb (def: 0)
    --help|-h          print out usage message
    --hex|-H           output response in hexadecimal; used twice
                       shows decoded values in hex
    --in=FN|-i FN      FN is a filename containing attribute values in
                       ASCII hex or binary if --raw also given
    --lvn=LVN|-l LVN    logical volume number (LVN) (def:0)
    --maxlen=LEN|-m LEN    max response length (allocation length in cdb)
                           (def: 0 -> 8192 bytes)
    --partition=PN|-p PN    partition number (PN) (def:0)
    --quiet|-q         reduce the amount of output, can use more than once
    --raw|-r           output response in binary
    --readonly|-R      open DEVICE read-only (def: read-write)
    --sa=SA|-s SA      SA is service action (def: 0)
    --verbose|-v       increase verbosity
    --version|-V       print version string and exit

Performs a SCSI READ ATTRIBUTE command. Even though it is defined in
SPC-3 and later it is typically used on tape systems.