Question

我正在尝试将一个expect脚本实现为一个bash脚本。因为我对bash / expect很新，所以请耐心等待。

以下是期望脚本按预期工作：

log_user 0

file delete foo.txt

set fh [open foo.txt a]

set servers {xxx@server1 xxx@server2}

foreach s $servers {
spawn ssh $s
expect "password: "
send "PASSWORD\r"
expect "$ "
send "grep "something" /some/log/file.log"
expect "$ " { puts $fh "$expect_out(buffer)"}
send "exit\r"
}

close $fh

现在，我希望将这个expect脚本包含在bash脚本中，但它不能按预期工作。

这是我到目前为止所做的：

#!/bin/bash

XYZ=$(expect -c "
file delete foo.txt

set fh [open foo.txt a]

set servers {xxx@server1 xxx@server2}

foreach s $servers {
spawn ssh $s
expect "password: "
send "PASSWORD\r"
expect "$ "
send "grep "something" /some/log/file.log"
expect "$ " { puts $fh "$expect_out(buffer)"}
send "exit\r"
}

close $fh
")

echo "$XYZ"

我得到的错误是：

command substitution: line 42: syntax error near unexpected token `('
command substitution: line 42: `expect "$ " { puts $fh "$expect_out(buffer)"}'

我愿意接受任何其他方式来实现这一点！：）

Answer 1

您可以使用/usr/bin/expect -c执行expect命令：

#!/bin/bash

/usr/bin/expect -c ' 

file delete foo.txt

set fh [open foo.txt a]

set servers {xxx@server1 xxx@server2}

foreach s $servers {
spawn ssh $s
expect "password: "
send "PASSWORD\r"
expect "$ "
send "grep "something" /some/log/file.log"
expect "$ " { puts $fh "$expect_out(buffer)"}
send "exit\r"
}

close $fh
'

Answer 2

Bertrand的回答是解决问题的一种方法，但并没有解释你正在做的事情的问题。

Bash尝试在双引号字符串中扩展变量，因此您的expect脚本会看到您要查看$servers，$s和$fh的空格。此外，你有三层嵌套的双引号字符串，这将导致解析expect的参数时出现各种问题。

这是一个意见问题，但我认为当某些事情被某个特定点视为自己的程序时，它应该被分成一个单独的文件。

#!/usr/bin/expect
log_user 0

file delete foo.txt

set fh [open foo.txt a]

set servers {xxx@server1 xxx@server2}

foreach s $servers {
    spawn ssh $s
    expect "password: "
    send "PASSWORD\r"
    expect "$ "
    send "grep 'something' /some/log/file.log"
    expect "$ " {
        puts $fh "$expect_out(buffer)"
    }
    send "exit\r"
}

close $fh

确保它是可执行的，然后从bash脚本中调用它：

#!/bin/bash
/usr/local/bin/my_expect_script

（为了做到这一点，你应该设置公钥认证，然后通过直接从bash运行ssh server "grep 'something' /some/log/file.log"来完全摆脱期望

期待在bash脚本中

2 个答案: