shell expect实现ssh免交互执行命令的三种用法

介绍：
https://www.cnblogs.com/chenjo/p/12892894.html

1.EOF 标准输出作为 expect 标准输入

#!/bin/bash
USER=root
PASS=123.com
IP=192.168.1.120
expect << EOF
set timeout 30
spawn ssh $USER@$IP
expect {
"(yes/no)" {send "yes
"; exp_continue}
"password:" {send "$PASS
"}
}
expect "$USER@*" {send "$1
"}
expect "$USER@*" {send "exit
"}
expect eof
EOF

方法 2：

#!/bin/bash
USER=root
PASS=123.com
IP=192.168.1.120
expect -c "
spawn ssh $USER@$IP
expect {
"(yes/no)" {send "yes
"; exp_continue}
"password:" {send "$PASS
"; exp_continue}
"$USER@*" {send "df -h
 exit
"; exp_continue}
}"

方法 3：将 expect 脚本独立出来
login.exp 登录文件：

#!/usr/bin/expect
set ip [lindex $argv 0]
set user [lindex $argv 1]
set passwd [lindex $argv 2]
set cmd [lindex $argv 3]
if { $argc != 4 } {
puts "Usage: expect login.exp ip user passwd"
exit 1
}
set timeout 30
spawn ssh $user@$ip
expect {
"(yes/no)" {send "yes
"; exp_continue}
"password:" {send "$passwd
"}
}
expect "$user@*" {send "$cmd
"}
expect "$user@*" {send "exit
"}
expect eof

执行命令脚本：

#!/bin/bash
HOST_INFO=user_info
for ip in $(awk '{print $1}' $HOST_INFO)
do
user=$(awk -v I="$ip" 'I==$1{print $2}' $HOST_INFO)
pass=$(awk -v I="$ip" 'I==$1{print $3}' $HOST_INFO)
expect login.exp $ip $user $pass $1
done

SSH 连接信息文件：
cat user_info
192.168.1.120 root 123456