Run slurp and grep time_wait sockets. Works on both linux as macos.

slurp-test.sh

#!/bin/bash
function socket_count(){ 
    if [[ "$OSTYPE" == "darwin"* ]]; then
        sysctl net.inet.tcp.tw_pcbcount | awk '{ print $2 }' 
    else
        netstat -n | grep -i 80| grep -i time_wait | wc -l
    fi
}
printf "Starting slurp..." && (slurp keyword -t example,example1,example2 &>/dev/null &)
sockets="$()"

while [[ "$(socket_count)" -le $sockets ]]; do
    printf '.'
    sleep 1
done
echo ' done.'

for i in {0..5}; do (echo "time_wait sockets: $(socket_count)" && sleep 1); done
sockets=$(socket_count)
printf "Stoping slurp..." && (killall slurp)

while [ "$(socket_count)" -ge $sockets ]; do
    printf '.'
    sleep 1
done
echo ' done.'


for i in {0..10}; do (echo "time_wait sockets: $(socket_count)" && sleep 1); done