期望脚本有问题 [英] Problem with an expect script

问题描述

我正在尝试创建脚本来更新服务器中的密码 非交互方式.它可以在我的笔记本电脑上运行，但是在我的服务器上无法运行. 两者都使用Etch运行相同的配置.

I'm trying to create a script to update a password in a non-interactive way. It's working on my laptop but fails on my server. Both are running the same configuration, using Etch.

这是脚本:

#!/usr/bin/expect -f
# Change user passwd
set timeout 30
strace 4
set password [lindex $argv 1]
set old_password [lindex $argv 2]

spawn passwd [lindex $argv 0]
sleep 1
expect "(current) UNIX password: $"
send "$old_password\r"
expect "Enter new UNIX password: $"
send "$password\r"
expect "Retype new UNIX password: $"
send "$password\r"
expect eof

在服务器上，输出如下所示:

On the server the output looks like this:

myuser@server:~$  /home/myuser/adm/chpasswd myuser NewPasswd OldPasswd
 2    lindex $argv 0
 1  set username [lindex $argv 0]
 2    lindex $argv 1
 1  set password [lindex $argv 1]
 2    lindex $argv 2
 1  set old_password [lindex $argv 2]
 1  spawn passwd $username
spawn passwd myuser
 1  sleep 1
 1  expect "(current) UNIX password: $"
Changing password for myuser
(current) UNIX password:  1  send "$old_password\r"
 1  expect "Enter new UNIX password: $"
OldPasswd
Enter new UNIX password:  1  send "$password\r"
 1  expect "Retype new UNIX password: $"
NewPasswd
 1  send "$password\r"
 1  expect eof
Retype new UNIX password:  1  exit 0

因此无法正常工作，因为这对夫妻的期望发送似乎不同步.

So is not working, as the couple expect-send seems unsync.

但奇怪的是，在我的笔记本电脑上它可以工作:

But strangely enough, on my laptop it works:

test@mars:/home/test/adm$ ./chpasswd test NewPasswd OldPasswd
 2    lindex $argv 1
 1  set password [lindex $argv 1]
 2    lindex $argv 2
 1  set old_password [lindex $argv 2]
 2    lindex $argv 0
 1  spawn passwd [lindex $argv 0]
spawn passwd test
 1  sleep 1
 1  expect "(current) UNIX password: $"
Changing password for test
(current) UNIX password:  1  send "$old_password\r"
 1  expect "Enter new UNIX password: $"
OldPasswd
Enter new UNIX password:  1  send "$password\r"
 1  expect "Retype new UNIX password: $"
NewPasswd
Retype new UNIX password:  1  send "$password\r"
 1  expect eof
NewPasswd
passwd: password updated successfully
 1  exit 0

任何想法为什么服务器上会出错? 谢谢

Any ideas why it's going wrong on the server ? Thanks

推荐答案

这是一个老问题，但无论如何...

This is an old question, but anyway...

尝试在脚本中添加"exp_internal 1".这样可以为您提供更多详细信息，说明您的期望为何不匹配.

Try adding "exp_internal 1" to your script. That will give you more verbose information about why your expects aren't matching.

为您的期望命令使用"-re"选项.您正在使用"$"锚定模式，但是Expect的默认匹配项是-glob，其中"$"并不特殊.

Use the "-re" option for your expect commands. You're using '$' to anchor the pattern, but the default matching for expect is -glob where '$' is not special.

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