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15 lines
336 B

function EPHEMERAL_PORT() {
LOW_BOUND=49152
RANGE=16384
while true; do
CANDIDATE=$[$LOW_BOUND + ($RANDOM % $RANGE)]
(echo "" >/dev/tcp/127.0.0.1/${CANDIDATE}) >/dev/null 2>&1
if [ $? -ne 0 ]; then
echo $CANDIDATE
break
fi
done
}
port=$(EPHEMERAL_PORT)
echo $port