linux에서 shell script로 ip/port open 확인을 한번에 여러개 하는법
#!/bin/bash
echo "www.google.com 443
naver.com 80
192.168.0.100 1" | (
TCP_TIMEOUT=3
while read host port; do
(CURPID=$BASHPID;
(sleep $TCP_TIMEOUT;kill $CURPID) &
bash -c 'exec 3<> /dev/tcp/'$host'/'$port';echo $?' 2>/dev/null
) 2>/dev/null
case $? in
0)
echo $host $port is open;;
1)
echo $host $port is closed;;
143|137) # killed by SIGTERM
echo $host $port timeouted;;
esac
done
) 2>/dev/null
#!/bin/bash를 빼고 터미널에 복붙하거나 .sh 파일로 저장하고 실행 권한을 부여해서 실행하면 된다.
scanme.nmap.org 80 is closed
scanme.nmap.org 81 is closed
192.168.0.100 1 is closed