如何让expect正确嵌套在bash脚本中？

Question

这是可以运行成功的预期文件。

#!/usr/bin/expect  -f
set host vps_ip
set user test
set loginpwd  passwd
set adminpwd  passwd
set timeout 300
set prompt "#|>|\$"    
spawn scp  /home/wpdatabase_backup.sql   $user@$host:/tmp
expect -nocase  "password:"
send "$loginpwd\r"
expect eof
spawn  ssh  $user@$host
expect -nocase "password:"
send "$loginpwd\r"
expect -re $prompt
send "su\r"
expect  "assword:"
send "$adminpwd\r"
expect -re $prompt
send "mysql -u root -pxxxx wpdatabase < /tmp/wpdatabase_backup.sql\r"
expect eof

这是 bash 文件：

mysqlword="xxxx"
mysqldump -u root -p$mysqlword wpdatabase > /home/wpdatabase_backup.sql

现在我想将expect文件嵌套在bash文件中，因为bash文件比expect文件更复杂，bash文件中的大部分行都被省略了。

代码：

#!/usr/bin/bash
mysqlword="xxxx"
mysqldump -u root -p$mysqlword wpdatabase > /home/wpdatabase_backup.sql    
/usr/bin/expect <<EOD
set host vps_ip
set user test
set loginpwd  passwd
set adminpwd  passwd
set timeout 300
set prompt "#|>|\$"

spawn scp  /home/wpdatabase_backup.sql   $user@$host:/tmp
expect -nocase  "password:"
send "$loginpwd\r"
expect eof
spawn  ssh  $user@$host
expect -nocase "password:"
send "$loginpwd\r"
expect -re $prompt
send "su\r"
expect  "assword:"
send "$adminpwd\r"
expect -re $prompt
send "mysql -u root -pxxxx wpdatabase < /tmp/wpdatabase_backup.sql\r"
expect eof
<<EOD

发生错误： spawn scp /home/wpdatabase_backup.sql @:/tmp
ssh：无法解析主机名：名称或服务未知
失去联系
发送：spawn id exp6 未打开
执行时
"send "\r""

引用终结者：

cat<<'EOD'
set host vps_ip
set user test
spawn scp  /home/wpdatabase_backup.sql   $user@$host:/tmp
EOD

结果：

set host vps_ip
set user test
spawn scp  /home/wpdatabase_backup.sql   $user@$host:/tmp

但是如何在bash中输出结果运行？

/usr/bin/expect  <<cat<<'EOD'
set host vps_ip
set user test
spawn scp  /home/wpdatabase_backup.sql   $user@$host:/tmp
EOD

代码不能运行!

Answer 1

这是因为在像 EOD 这样带有不带引号的终止符的 here-document 中，参数替换是由 shell 执行的。你可以看到，如果将 /usr/bin/expect 替换为 cat:

$ cat<<EOD
set host vps_ip
set user test
spawn scp  /home/wpdatabase_backup.sql   $user@$host:/tmp
EOD

结果：

set host vps_ip
set user test
spawn scp  /home/wpdatabase_backup.sql   @:/tmp

那么，如何避免参数替换呢？引用终结者：

$ cat<<'EOD'
set host vps_ip
set user test
spawn scp  /home/wpdatabase_backup.sql   $user@$host:/tmp
EOD

结果：

set host vps_ip
set user test
spawn scp  /home/wpdatabase_backup.sql   $user@$host:/tmp

如何让expect正确嵌套在bash脚本中？

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