bash腳本內的期望

Question

我想實現一個期望腳本到b​​ash腳本中。忍受着我，因爲我對bash/expect有點陌生。

這裏是希望腳本按預期工作：

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 

現在，我希望能在包括一個bash腳本這expect腳本但預期它不工作。

這是我到目前爲止有：

#!/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" 

我得到的錯誤是：

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

我接受任何其他方式來實現這個！ :)

Answer 1

您可以使用/usr/bin/expect -c執行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的答案是解決你的問題的一種方式，但不與你在做什麼解釋這個問題。

猛砸試圖擴大雙引號內的字符串變量，所以你expect腳本會看到空白的空間，您希望看到$servers，$s和$fh。此外，你有三重嵌套的雙引號字符串，這將導致解析參數到expect的各種問題。

這是一個意見問題，但我認爲當某些事情被認爲是自己的程序時，它應該被分離成一個單獨的文件。

#!/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 

確保它是可執行文件，然後從你的bash腳本中調用它：

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

（要做到這一點真的很正確，你應該建立公共密鑰認證，然後你就可以擺脫的期望通過直接從bash運行ssh server "grep 'something' /some/log/file.log"）