Make static arp with bash

#!/bin/bash

start=$1
end=$2
ar=/usr/bin/arping
arp=/usr/sbin/arp
echo "Start is $start and end is $end"
echo
start_end=${start##*.}
end_end=${end##*.}

for i in $(seq $start_end $end_end);do   
    $arp -s `$ar -I eth0 ${start%.*}.$i -c 1 |\
    grep "Unicast" | awk -F" " '{print $4," ",$5}' |\
    sed -e 's/\[//' -e 's/\]//'`
done