expect 脚本内如何自动根据ip的不同，send不同的密码

lipengyu1573

我这里现有一个expect脚本
#!/usr/bin/expect
set Host [lindex $argv 0]
send $Host[0]\n
proc do_command {} {
expect "*$"
send "df -hT\r"
}
spawn ssh -p 22 root@192.168.$Host
set do_done 1
#while ($do_done)
expect {
                "(yes/no)?"     {send "yes\r";exp_continue}
                "*password"     {send "12345678\r"}
}
interact

可以实现登陆内网的服务器，我们内网，以及线上的服务器密码不同，所以需要两个登陆脚本
我想问一下，expect内如何分析传过来的参数，然后再做不同的处理呢？
例如：我们内网的ip是192.168.1.*  。线上的ip都是192.168.101.*
如何根据第三位数字的不同来进行不同的逻辑呢？
我找了许多expect的教程，找到了了一些条件语句的写法，但是找不到在expect脚本内分析字符串的方法，请问各位，有什么办法吗

expert1

回复 1# lipengyu1573


    刚好有个类似的问题，你看下这个 http://blog.chinaunix.net/uid-20778583-id-5168027.html

   跟expect类似，但是python.

   就是加个判断呀，if ip == 'xxx'  这种。

expert1

expect太简单，要pexpect办法就多了，还可以用dict来处理。

lipengyu1573

回复 3# expert1


    额，条件语句我会写啊，就是不会怎么在expect中提出来ip的第三段

听你的说法，好像做不到？

expert1

回复 4# lipengyu1573


    Google了一下，应该是可以的expect本来是基于tcl/tk这个冷门的语言写的，

The Control Flow
If Condition
The Syntax:

if { test1 } {
body1
} elseif { test2 } {
body2
} else {
bodyn
}

If you don't like the curly brackets, you can take them out. But then, you will have to give the full thing in one line. I know that after you had a look at that syntax, you are still wondering what in the world that was. Don't worry - an example will set things straight.


#The marriage status script...
#Change the status please
set marital_status "After"

label .thesis -text "Marriage is a three ring circus..."

if { $marital_status=="Before" } {
set ring "Engagement"
} elseif { $marital_status=="During" } {
set ring "Wedding"
} else {
set ring "suffe -"
}

label .proof -text "$marital_status Marriage: $ring ring"

pack .thesis
pack .proof

Run this script and give the 'marital_status' to "Before", "During" and "After" and see the different results.
Operators

You will need operators to do the checking. Fortunately, the operators in Tcl are same as in any other language. So a small experience with any language will guarantee that you know all them.
Tcl has two kinds of operators.
Relational operators: <, <=, >, >=, ==, != return 0 (false) or 1 (true).
Operator in Tcl         Meaning         Example
==        is equal to        5 == 6
!=        is not equal to        5 != 6
<        is less than         5 < 6
<=         is less than or equal to         5 <= 6
>        is greater than         5 > 6
>=        is greater than or equal to         5 >= 6

Logical Operators: && , ! and || operator - AND, NOT and OR Operators.
Operator         Logical Equivalent         Example
! expression        NOT        !$a
expression1 && expression2        AND        $a > 6 && $a < 10
expression1 || expression2        OR        $a != 6 || $a!=5

expert1

if的语句如下

if { test1 } {
body1
} elseif { test2 } {
body2
} else {
bodyn
}

判断一下ip等于多少，send它的密码过去，这个真不如python好，直接做个dict数据比较爽。

expert1

http://inguza.com/document/expect-and-tcl-mini-reference-manual

这是手册，很简单的。

423497786

直接用shell判断然后在调用expect，就像下面这样
if  ...;then
echo "[MESSAGE]scp -r -P $port $localPath $user@$ipremotePath"
expect -c "
  spawn  bash $tmpScriptFile
  expect {
    \"$user@$ip*assword:\" {set timeout 3600;send \"$passwd\r\";}
    \"(yes/no)?\" {send \"yes\r\"; exp_continue;}
  }
  expect eof"
else
  ....
fi