以下是以telnet對(duì)端22端口為例 

station91:~/shell/telnet_port # pwd 
/root/shell/telnet_port 
station91:~/shell/telnet_port # cat telnet_port.sh 
#!/bin/bash 
rm telnet_result.txt >/dev/null 2>&1 
PORT_22=22 
for i in $(cat ip.list) 
do (telnet $i $PORT_22<<EOF>>telnet_result.txt &) >/dev/null 2>&1 
#加&讓其并行執(zhí)行,>>telnet_result.txt記錄telnet過程中的日志 
quit 
EOF 
done 
cat telnet_result.txt | grep -B 1 \] | grep [1-9] | awk '{print $3}' | cut -d '.' -f 1,2,3,4 > telnet_alive.txt 
cat ip.list telnet_alive.txt | sort | uniq -u > telnet_die.txt 

station91:~/shell/telnet_port # for i in {88..93};do echo "192.168.14.$i">>ip.list;done #使用for循環(huán)得到需要telnet主機(jī)的ip 
station91:~/shell/telnet_port # cat ip.list 
192.168.14.88 
192.168.14.89 
192.168.14.90 
192.168.14.91 
192.168.14.92 
192.168.14.93 
station91:~/shell/telnet_port # ls 
ip.list telnet_port.sh 
station91:~/shell/telnet_port # ./telnet_port.sh & 
[1] 16848 
station91:~/shell/telnet_port # ls 
ip.list telnet_alive.txt telnet_die.txt telnet_port.sh telnet_result.txt 
[1]+ Done ./telnet_port.sh 
station91:~/shell/telnet_port # cat telnet_alive.txt //從本機(jī)telnet對(duì)端22端口能telnet通的只有192.168.14.91 
192.168.14.91 
station91:~/shell/telnet_port # cat telnet_die.txt 
192.168.14.88 
192.168.14.89 
192.168.14.90 
192.168.14.92 
192.168.14.93 
station91:~/shell/telnet_port # cat telnet_result.txt //記錄的日志格式 
Trying 192.168.14.91... 
Connected to 192.168.14.91. 
Escape character is '^]'. 
Trying 192.168.14.88... 
Trying 192.168.14.89... 
Trying 192.168.14.90... 
Trying 192.168.14.92... 
Trying 192.168.14.93...