Linux Expect 自動化套件

安裝Expect

apt install expect

使用範例

自動telnet登入

建立telnet_expect.sh

#!/usr/bin/expect
set username "test"
set password "test123"
set command "use command"
spawn telnet $ip
    expect {
        "*ogin:" {
            send "$username\r"
            expect "*assword:"
            send "$password\r"
            expect ">"
            send "$command\r"
            expect ">"
            send "exit\r"
        }
    }

chmod +x telnet_expect.sh

多台設備多線程自動登入

建立設備清單，建立ip.txt

device_a*192.168.0.1
device_b*192.168.0.2
device_c*192.168.0.3

建立多線程腳本telnet.sh，創建log資料夾儲存log

#!/bin/bash
rm log/*

for i in `cat ip.txt`
do {
substr=$(echo $i | cut -d"*" -f 2)
kip=$substr
substr=$(echo $i | cut -d"*" -f 1)
kname=$substr
/usr/bin/expect expect.sh $kip $kname
}&
done
wait

建立expect.sh

#!/usr/bin/expect
set timeout 30
set username "test"
set password "test123"
set command "show configuration |display set|no-more"
set date [ clock format [ clock seconds ] -format "%Y%m%d" ]
set kip [lindex $argv 0]
set kname [lindex $argv 1]

spawn telnet $kip
log_file "log/$date-${kname}.log"
expect {
        "*ogin:" {
                send "$username\r"
                expect "*assword:"
                send "$password\r"
                expect ">"
                send "set cli timestamp\r"
                expect ">"
                send "$command\r"
                expect ">"
                send "exit\r"
                log_file
        }
}

chmod +x expect.sh

執行telnet.sh