nc: invalid option -- ‘z‘ 解决办法

nc -z -v -w1 host port
nc: invalid option -- 'z'
Ncat: Try `--help' or man(1) ncat for more information, usage options and help. QUITTING.

#!/bin/bash
> nc.log
sed -i 's#https://##g' nc.conf
sed -i 's#http://##g' nc.conf
sed -i 's#[/]*##g' nc.conf
split -l 100 nc.conf spilitnc.conf

for j in `ls spilitnc.conf*`
do

for i in `cat "${j}"`
do
ip=`echo $i |awk -F':' '{print $1}'`
port=`echo $i |awk -F':' '{print $2}'`
cat /dev/null| nc -v -w 3 -t $ip $port
if [ $? -eq 0 ];then
echo "$ip:$port connect success" >>nc.log
else
echo "$ip:$port connect failed" >>nc.log
fi
done
done

rm -f spilitnc.conf*