Check port is open in shell

Moki Lv6
  2022-02-01 20:14:54 2022-02-01 20:14:54 Created   2022-02-01 20:14:54 2022-02-01 20:14:54 Updated  
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while read host port; do
    r=$(bash -c 'exec 3<> /dev/tcp/'$host'/'$port';echo $?' 2>/dev/null)
    if [ "$r" = "0" ]; then
        echo "$host $port is open"
    else
        echo "$host $port is closed"
        exit 1
    fi
done
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Check port is open in shell