在shell腳本中添加對命令的回答

Question

我在想如何在shell腳本中添加對命令的回答。我知道這不是很清楚，因爲我不知道如何描述它。例如：

$> su 
$> Password: <automatically_fill_in_the_password_here> 

我將如何自動填寫密碼？

Answer 1

expect是你在找什麼。

允許我引用this page，因爲它在解釋expect做了很好的工作：

期待是Unix和Linux自動化和測試工具。它適用於交互式應用程序，如telnet,ftp,passwd,fsck,rlogin,tip,ssh和許多其他。它使用Unix僞終端透明地包裝子過程，允許通過終端訪問任意應用程序的自動化。

下面是一個簡單的期望腳本，用於爲遠程SSH服務器提供OpenSSH root/admin密碼並執行Unix/Linux/BSD命令。 （首先，你需要install expect tool by following these instructions）

#!/usr/bin/expect -f 
# Expect script to supply root/admin password for remote ssh server 
# and execute command. 
# This script needs three argument to(s) connect to remote server: 
# password = Password of remote UNIX server, for root user. 
# ipaddr = IP Addreess of remote UNIX server, no hostname 
# scriptname = Path to remote script which will execute on remote server 
# For example: 
# ./sshlogin.exp password 192.168.1.11 who 
# ------------------------------------------------------------------------ 
# Copyright (c) 2004 nixCraft project <http://cyberciti.biz/fb/> 
# This script is licensed under GNU GPL version 2.0 or above 
# ------------------------------------------------------------------------- 
# This script is part of nixCraft shell script collection (NSSC) 
# Visit http://bash.cyberciti.biz/ for more information. 
# ---------------------------------------------------------------------- 
# set Variables 
set password [lrange $argv 0 0] 
set ipaddr [lrange $argv 1 1] 
set scriptname [lrange $argv 2 2] 
set arg1 [lrange $argv 3 3] 
set timeout -1 
# now connect to remote UNIX box (ipaddr) with given script to execute 
spawn ssh root@$ipaddr $scriptname $arg1 
match_max 100000 
# Look for passwod prompt 
expect "*?assword:*" 
# Send password aka $password 
send -- "$password\r" 
# send blank line (\r) to make sure we get back to gui 
send -- "\r" 
expect eof 

在CAS一個沒有看過劇本的意見（你真的應該），這裏是如何使用它：

./sshlogin.exp password 192.168.1.11 who