生成后会出现第一个提示

Question

I want to make a script that it take as expect first promt after spawn "ssh user@server" .

Am example:

I have 5 servers but all differs the initial promt and i can't modify:

[root@test home]#
root@server2:~$
User: root Server: server3 ~ !

You got the point.

This is how i think but i can't figure out how to get that

    set timeout -1
    spawn "ssh root@server"

    expect "assword:"
    send "password\n"

#
    var=getpromt
#   
    expect "$var"
    send "stuff\n"

    expect eof

How can i get those promts to a expect script that can recognize that is the promt to follow?

Answer 1

I would just keep an array of regular expressions:

array set prompt_re {
    test    {#\s*$}
    server2 {$\s*$}
    server3 {!\s*$}
}

spawn ssh $user@$host

expect assword:
send "$password\r"

expect -re $prompt_re($host)

Or, you could mash those up into a single regex

expect -re {[#$!]\s*$}   ;# expect the prompt.

Answer 2

Try this (pseudo code):

echo commands-to-be-executed-on-ssh | expect-script

& your expect-script would looks something like:

set timeout -1
spawn "ssh root@server"

expect "assword:"
send "password\n"
interact # <~~~~~~~~~~~ At this point, expect would pass the redirected/piped stdin to ssh process.

Note: I haven't tested this. So apologies for any syntax errors :)