Linux系统shell脚本之Expect实现SSH免交互执行命令

• 一、Expect介绍
• 二、安装expect软件包
• 三、编写expect脚本
• • 四、执行脚本

Expect是一个自动交互式应用程序的工具，如telnet，ftp，passwd等。

yum -y install expect

root@192 scripts]# cat expect_ssh.sh 
#!/bin/bash
########################################
#Author:jeven
#time:Thu 12 May 2022 05:20:05 PM CST
#filename:expect_ssh.sh
#Script description:
########################################


USER=root
PASS=123456
IP=192.168.3.211
expect -c "
    spawn ssh $USER@$IP
        expect {
	    "(yes/no)" {send "yesr"; exp_continue}
	    "password:" {send "$PASSr"; exp_continue}  
	    "$USER@*" {send "df -hr exitr"; exp_continue}
	}"

[root@192 scripts]# ./expect_ssh.sh 
spawn ssh root@192.168.3.211
Activate the web console with: systemctl enable --now cockpit.socket

Last login: Thu May 12 17:56:29 2022 from 192.168.3.84
[root@node1 ~]# df -h
Filesystem             Size  Used Avail Use% Mounted on
devtmpfs               970M     0  970M   0% /dev
tmpfs                  984M     0  984M   0% /dev/shm
tmpfs                  984M  9.4M  974M   1% /run
tmpfs                  984M     0  984M   0% /sys/fs/cgroup
/dev/nvme0n1p3          18G   11G  7.3G  59% /
/dev/sdb3              2.0G   47M  2.0G   3% /mnt/vdb3
/dev/mapper/vg01-lv01  7.0G   83M  7.0G   2% /mnt/lv01
/dev/mapper/vg02-lv02  575M  912K  532M   1% /mnt/lv02
/dev/nvme0n1p1         495M  140M  356M  29% /boot
overlay                 18G   11G  7.3G  59% /var/lib/docker/overlay2/8c7e59c24a0b2648c82f41eeddba522e58e06c6809ff702f641f6377b60e8d1f/merged
overlay                 18G   11G  7.3G  59% /var/lib/docker/overlay2/3851b60316c4c9b3d888c4e6133589bee2882b3e231cf2c4d9ff42eca7a4a390/merged
tmpfs                  197M  4.0K  197M   1% /run/user/0
[root@node1 ~]#  exit
logout
Connection to 192.168.3.211 closed.