Unknown switch: --help
Usage: sg_map [-a] [-h] [-i] [-n] [-sd] [-scd or -sr] [-st] [-V] [-x]
  where:
    -a      do alphabetic scan (ie sga, sgb, sgc)
    -h or -?    show this usage message then exit
    -i      also show device INQUIRY strings
    -n      do numeric scan (i.e. sg0, sg1, sg2) (default)
    -sd     show mapping to disks
    -scd    show mapping to cdroms (look for /dev/scd<n>
    -sr     show mapping to cdroms (look for /dev/sr<n>
    -st     show mapping to tapes (st and osst devices)
    -V      print version string then exit
    -x      also show bus,chan,id,lun and type

If no '-s*' arguments given then show all mappings. This utility
is DEPRECATED, do not use in Linux 2.6 series or later.