从本机连接到远程机，发起SSH连接，执行命令cd ~/Downloads;ls

#!/bin/bash

# router parameters
ROUTER_USER="xiaoqiang"
ROUTER_HOST="192.168.0.110"
ROUTER_PASSWORD="1"
ROUTER_PORT="22"       # default

# start except
expect <<-EOF
set timeout -1
spawn ssh $ROUTER_USER@$ROUTER_HOST -p $ROUTER_PORT -o StrictHostKeyChecking=no -C "cd ~/Downloads;ls"
expect "*password:"
send "$ROUTER_PASSWORD\n\r\n"
expect eof;
EOF

首次远程连接时，会提示公钥确认，远程IP改变时，会提示公钥不一致，这种情况有时非常烦人。对于自动化任务，我们希望跳过公钥确认，修改/etc/ssh/ssh_config，加入：

StrictHostKeyChecking no

或者在命令行中使用-o参数： ssh -o StrictHostKeyChecking=no

运行结果:

spawn ssh xiaoqiang@192.168.0.110 -p 22 -o StrictHostKeyChecking=no -C cd ~/Downloads;ls
xiaoqiang@192.168.0.110's password: 
c-ares-1.17.0.tar.gz
cd1folder.zsh
CursorTheme
darcula.css
g2o_curve_fitting

在password一行之后为命令执行的结果，一直没法实现换行，不太完美