#!/bin/bash

cat <<EOF
Unknown switch: (null)
multipath-tools v0.4.9 (05/33, 2016)
Usage:
  multipath [-a|-A|-c|-w|-W] [-d] [-T tm:val] [-r] [-v lvl] [-p pol] [-b fil] [-q] [dev]
  multipath -l|-ll|-f [-v lvl] [-b fil] [dev]
  multipath -F [-v lvl]
  multipath -t
  multipath -h

Where:
  -h      print this usage text
  -l      show multipath topology (sysfs and DM info)
  -ll     show multipath topology (maximum info)
  -f      flush a multipath device map
  -F      flush all multipath device maps
  -a      add a device wwid to the wwids file
  -A      add devices from kernel command line mpath.wwids
          parameters to wwids file
  -c      check if a device should be a path in a multipath device
  -T tm:val
          check if tm matches the multipathd timestamp. If so val is
          whether or not the device is a path in a multipath device
  -q      allow queue_if_no_path when multipathd is not running
  -d      dry run, do not create or update devmaps
  -t      dump internal hardware table
  -r      force devmap reload
  -B      treat the bindings file as read only
  -p      policy failover|multibus|group_by_serial|group_by_prio
  -b fil  bindings file location
  -w      remove a device from the wwids file
  -W      reset the wwids file include only the current devices
  -p pol  force all maps to specified path grouping policy :
          . failover            one path per priority group
          . multibus            all paths in one priority group
          . group_by_serial     one priority group per serial
          . group_by_prio       one priority group per priority lvl
          . group_by_node_name  one priority group per target node
  -v lvl  verbosity level
          . 0 no output
          . 1 print created devmap names only
          . 2 default verbosity
          . 3 print debug information
  dev     action limited to:
          . multipath named 'dev' (ex: mpath0) or
          . multipath whose wwid is 'dev' (ex: 60051..)
          . multipath including the path named 'dev' (ex: /dev/sda)
          . multipath including the path with maj:min 'dev' (ex: 8:0)
EOF