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 "
" {send "pressed enter
"}
-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
"}
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
" }
"hehe" { send “Hehe yourself
" }
"bye" { send “Good bye
" }
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
"}
"hehe" { send "Hehe yourself
"}
"bye" { send “Good bye
"}
}
#!/usr/bin/expect
spawn scp /etc/fstab 192.168.8.100:/app
expect {
"yes/no" { send "yes
";exp_continue }
"password" { send “magedu
" }
}
expect eof
#!/usr/bin/expect
spawn ssh 192.168.8.100
expect {
"yes/no" { send "yes
";exp_continue }
"password" { send “magedu
" }
}
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
";exp_continue }
"password" { send "$password
" }
}
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
";exp_continue }
"password" { send "$password
" }
}
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
";exp_continue }
"password" { send "$password
" }
}
expect "]#" { send "useradd haha
" }
expect "]#" { send "echo magedu |passwd --stdin haha
" }
send "exit
"
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
";exp_continue }
"password" { send "$password
" }
}
expect "]#" { send "useradd hehe
" }
expect "]#" { send "echo magedu |passwd --stdin hehe
" }
expect "]#" { send "exit
" }
expect eof
EOF
#./ssh5.sh 192.168.8.100 root magedu