以下是以telnet对端22端口为例

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&让其并行执行,>>telnet_result.txt记录telnet过程中的日志

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循环得到需要telnet主机的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 //从本机telnet对端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 //记录的日志格式

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...