期望里面 bash + 错误 # args: 应该是“foreach varList list ?varList list ...? command”
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expect inside bash + wrong # args: should be "foreach varList list ?varList list ...? command"
提问by Tivakar
I am using expect script inside bash script. When I use foreach inside expect script, it throws
我在bash脚本中使用expect脚本。当我在期望脚本中使用 foreach 时，它会抛出
wrong # args: should be "foreach varList list ?varList list ...? command"
错误 # args: 应该是“foreach varList list ?varList list ...? command”
The code:
编码：
#!/bin/bash
read -p "Enter username: " username
read -s -p "Enter password: " password
#Expect script
/bin/expect -<<EOD
set SERVERS {100 101 102}
foreach SERVER $SERVERS {
set timeout -1
spawn scp ${username}@plsa${SERVER}.corp.com:/log.2011-11-24 ${SERVER}
expect "*password:"; send "$password\r"
expect eof }
EOD
echo "completed"
Thanks
谢谢
回答by Kevin
The heredoc (<<ENDTOK) is subject to shell expansion on the $variables. That means for each of the $variables you want expect to interpret, you'll need to escape the $.
Heredoc( <<ENDTOK) 在$variables. 这意味着对于$variable您希望解释的每个s，您都需要转义$.
The way to escape something is to prepend a slash to it ($-> \$).
It appears the username and password are supposed to come from the shell, the rest from within expect, so here's how that should go:
逃避某些东西的方法是在它前面加上一个斜杠（$-> \$）。
看来用户名和密码应该来自shell，其余的来自expect，所以应该怎么做：
#!/bin/bash
read -p "Enter username: " username
read -s -p "Enter password: " password
#Expect script
/bin/expect -<<EOD
set SERVERS {100 101 102}
foreach SERVER $SERVERS {
set timeout -1
spawn scp ${username}@plsa${SERVER}.corp.com:/log.2011-11-24 ${SERVER}
expect "*password:"; send "$password\r"
expect eof }
EOD
echo "completed"
Note the \in front of $SERVERSand ${SERVER}.
请注意\前面$SERVERS和${SERVER}。
回答by Adam Zalcman
You need to escape dollar signs with a backslash since $nameis expended to the value of variable name:
你需要用反斜杠转义美元符号，因为它$name被消耗到变量的值name：
/bin/expect -<<EOD
set SERVERS {100 101 102}
foreach SERVER $SERVERS {
set timeout -1
spawn scp ${username}@plsa${SERVER}.corp.com:/log.2011-11-24 ${SERVER}
expect "*password:"; send "$password\r"
expect eof }
EOD
回答by glenn Hymanman
If you quote your here-document delimiter, the embedded script is effectively quoted too:
如果引用 here-document 分隔符，则嵌入的脚本也被有效引用：
/bin/expect -<<'EOD'
... expect script as posted ...
EOD
