Implementation method of batch parallel Telnet end-to-end port in Linux

The following is an example of Telnet to port 22

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< >telnet_result.txt &) >/dev/null 2>&1

#加 & Let it execute in parallel, >>telnet_result.txt logs during Telnet

Quit

Eof

Done

Cat Telnet_result.txt | Grep-b 1] | grep [1-9] | awk ' {print $} ' | 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};d o 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//from native Telnet to port 22 port can telnet through only 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//logging log format

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 ...