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function reverse_ipv4 --description "Print reverse IPv4 address" -a ipv4addr
set -l i '4'
set -l rquad '' '' '' ''
for item in (string split --right --max 3 . $ipv4addr)
set rquad[$i] $item
set i (math $i-1)
end
echo "$rquad[1].$rquad[2].$rquad[3].$rquad[4]"
end
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