bash - 期望登录后无法执行命令

Question

我有以下脚本:

#!/usr/bin/expect -f

    set timeout 60

    spawn ssh -X user@login.domain.co.uk

    expect "Password:"
    # Send the password, and then wait for a shell prompt.
    send "password\r"
    exp_continue
    expect "user*"
    send "ls -la\r"

但是我得到以下内容:

Password: command returned bad code: -101
    while executing
"exp_continue"
    (file "./hpclogin.sh" line 10)

如果我删除exp_continue，即

#!/usr/bin/expect -f

    set timeout 60

    spawn ssh -X user@login.domain.co.uk

    expect "Password:"
    # Send the password, and then wait for a shell prompt.
    send "password\r"
    expect "user*"
    send "ls -la\r"

我可以成功登录，但是没有执行ls -la命令。我的程序的流程控制有问题吗？

Answer 1

exp_continue仅在expect块内有用。例如:

spawn ssh -X user@example.com
expect {
    "continue connecting (yes/no)? " {
        send "yes\r"
        exp_continue"
    }
    "Password:"
}
send "password\r"

我认为您没有看到ls输出，因为您不希望在发送后看到任何东西。根据您的工作流程，这里有两个想法:

将命令添加为ssh的参数

spawn ssh -X user@example.com ls -la
expect {
    "continue connecting (yes/no)? " {
        send "yes\r"
        exp_continue"
    }
    "Password:"
}
send "password\r"
expect eof

在命令后会出现提示，然后注销

spawn ssh -X user@example.com
expect {
    "continue connecting (yes/no)? " {
        send "yes\r"
        exp_continue"
    }
    "Password:"
}
send "password\r"
expect $theprompt
send "ls -la\r"
expect $theprompt
send "exit\r"
expect eof

当然，使用ssh键会更简单:

ssh-keygen
ssh-copy-id user@example.com
ssh -X user@example.com ls -la