fping: invalid option -- '-'

Usage: fping [options] [targets...]

   -a         show targets that are alive

   -A         show targets by address

   -b n       amount of ping data to send, in bytes (default 56)

   -B f       set exponential backoff factor to f

   -c n       count of pings to send to each target (default 1)

   -C n       same as -c, report results in verbose format

   -D         print timestamp before each output line

   -e         show elapsed time on return packets

   -f file    read list of targets from a file ( - means stdin) (only if no -g specified)

   -g         generate target list (only if no -f specified)

                (specify the start and end IP in the target list, or supply a IP netmask)

                (ex. fping -g 192.168.1.0 192.168.1.255 or fping -g 192.168.1.0/24)

   -H n       Set the IP TTL value (Time To Live hops)

   -i n       interval between sending ping packets (in millisec) (default 25)

   -l         loop sending pings forever

   -m         ping multiple interfaces on target host

   -n         show targets by name (-d is equivalent)

   -p n       interval between ping packets to one target (in millisec)

                (in looping and counting modes, default 1000)

   -q         quiet (don't show per-target/per-ping results)

   -Q n       same as -q, but show summary every n seconds

   -r n       number of retries (default 3)

   -s         print final stats

   -I if      bind to a particular interface

   -S addr    set source address

   -t n       individual target initial timeout (in millisec) (default 500)

   -T n       ignored (for compatibility with fping 2.4)

   -u         show targets that are unreachable

   -O n       set the type of service (tos) flag on the ICMP packets

   -v         show version