expect

expect 语法:
  expect [选项] [ -c cmds ] [ [ -[f|b] ] cmdfile ] [ args ]
  选项
    -c:从命令行执行expect脚本,默认expect是交互地执行的
      示例:expect -c 'expect "\n" {send "pressed enter\n"}
    -d:可以输出输出调试信息
      示例:expect -d ssh.exp
  expect中相关命令
    spawn:启动新的进程
    send:用于向进程发送字符串
    expect:从进程接收字符串
    interact:允许用户交互
    exp_continue 匹配多个字符串在执行动作后加此命令

 

  expect最常用的语法(tcl语言:模式-动作)
  单一分支模式语法:
    expect “hi” {send “You said hi\n"}
    匹配到hi后,会输出“you said hi”,并换行
  多分支模式语法:
    expect "hi" { send "You said hi\n" } \
    "hehe" { send “Hehe yourself\n" } \
    "bye" { send “Good bye\n" }
    匹配hi,hello,bye任意字符串时,执行相应输出。等同如下:
    expect {
    "hi" { send "You said hi\n"}
    "hehe" { send "Hehe yourself\n"}
    "bye" { send “Good bye\n"}
    }

 

#!/usr/bin/expect
spawn scp /etc/fstab 192.168.8.100:/app
expect {
  "yes/no" { send "yes\n";exp_continue }
  "password" { send “magedu\n" }
}
expect eof

 

#!/usr/bin/expect
spawn ssh 192.168.8.100
expect {
  "yes/no" { send "yes\n";exp_continue }
  "password" { send “magedu\n" }
}
interact
#expect eof

 

示例:变量

#!/usr/bin/expect
set ip 192.168.8.100
set user root
set password magedu
set timeout 10
spawn ssh $user@$ip
expect {
  "yes/no" { send "yes\n";exp_continue }
  "password" { send "$password\n" }
}
interact

 

 

示例:位置参数

#!/usr/bin/expect
set ip [lindex $argv 0]
set user [lindex $argv 1]
set password [lindex $argv 2]
spawn ssh $user@$ip
expect {
  "yes/no" { send "yes\n";exp_continue }
  "password" { send "$password\n" }
}
interact
#./ssh3.exp 192.168.8.100 root magedu

 

 

示例:执行多个命令

#!/usr/bin/expect
set ip [lindex $argv 0]
set user [lindex $argv 1]
set password [lindex $argv 2]
set timeout 10
spawn ssh $user@$ip
expect {
  "yes/no" { send "yes\n";exp_continue }
  "password" { send "$password\n" }
}
expect "]#" { send "useradd haha\n" }
expect "]#" { send "echo magedu |passwd --stdin haha\n" }
send "exit\n"
expect eof
#./ssh4.exp 192.168.8.100 root magedu

 

 

示例:shell脚本调用expect

#!/bin/bash
ip=$1
user=$2
password=$3
expect <<EOF
set timeout 10
spawn ssh $user@$ip
expect {
  "yes/no" { send "yes\n";exp_continue }
  "password" { send "$password\n" }
}
expect "]#" { send "useradd hehe\n" }
expect "]#" { send "echo magedu |passwd --stdin hehe\n" }
expect "]#" { send "exit\n" }
expect eof
EOF
#./ssh5.sh 192.168.8.100 root magedu

 

 

 

 

 

 

 

posted on 2018-12-06 22:39  tony3154  阅读(73)  评论(0编辑  收藏

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