Shell登陆远程服务器

　　现场服务器较多，密码3个月过期，在到期时需更改密码。

　　使用expect编写，尝试登陆2次后退出（防止密码错误时账号锁定），超时重试一次。

　　shell脚本调用并定时执行，登陆成功后执行一条命令，如：hostname、uname等，根据退出状态判断密码是否到期。

　　0--正常

　　1--传入参数错误

　　2--timeout

　　3--密码错误或到期

　　脚本如下：　

#!/usr/bin/expect

###############################################################
# 连接远程主机
proc do_login {passwd} {
    set timeout 30
    set done 1
    set timeout_case 0
    set ps1 {PS1="doraemon#";export PS1}
    while {$done<3} {
        expect {
            *assword* {
                send $passwd\r
                incr done
            }
            \[$%>#] {
                set done 5
                send $ps1\r\r
                break
            }
            timeout {
                set done 1
                switch -- $timeout_case {
                    1 { send_user "try again ...\n" }
                    2 { exit 2
                        expect eof
                    }
                }
                incr timeout_case
            }
        }
    }
    if {$done==3} {
        exit 3
        expect eof
    }
}
###############################################################
# 执行命令
proc exec_cmd {cmd} {
    expect -re "doraemon#$"
    send_user "\$cmd: $cmd\n"
    send $cmd\r
}
###############################################################
# 退出
proc logout {} {
    expect -re "doraemon#$"
    send exit\r
    expect eof
}
###############################################################
if {$argc < 4} {
    send_user "Usage:$argv0 user pass ip command\n"
    exit 1
}
set user [lindex $argv 0]
set pass [lindex $argv 1]
set ip [lindex $argv 2]
set num 3

spawn ssh -o StrictHostKeyChecking=no -l $user $ip 
do_login $pass
while {$num<$argc} {
    set proc [lindex $argv $num]
    # 捕获输出用
    set cmd "echo ==$ip==$user==`$proc`=="
    exec_cmd $cmd
    incr num
}           
logout

 　　测试输出：

[root@centos1 shcript]# ./logon.expect 
Usage:./logon.expect user pass ip command
[root@centos1 shcript]# ./logon.expect root root123 127.0.0.1 hostname
spawn ssh -o StrictHostKeyChecking=no -l root 127.0.0.1
root@127.0.0.1's password: 
Last login: Fri Aug 14 02:54:56 2015 from 127.0.0.1
[root@centos1 ~]# PS1="doraemon#";export PS1
doraemon#
doraemon#$cmd: echo ==127.0.0.1==root==`hostname`==
echo ==127.0.0.1==root==`hostname`==
==127.0.0.1==root==centos1==
doraemon#exit
logout
Connection to 127.0.0.1 closed.
[root@centos1 shcript]# echo $?
0