无法使用expect获取shell中的$ expect_out（缓冲区）和$ expect_out（0，string）值

Question

如果我希望将代码编入shell脚本，我将无法获得$ expect_out（缓冲区）和$ expect_out（0，string）的值。

以下是我编码的示例代码。

 [Linux Dev:upncommn ~]$ cat expshl.sh
 #!/bin/bash
 expect << EOF
 spawn  "/home/upncommn/expectecho.sh"
 expect {
 "hi"  { send_user "You said_hi $expect_out(buffer)\n";
         send_user "Sting $expect_out(0,string)\n"
                 exit 1
        }
 "*bd*" { send_user "You said $expect_out(buffer)\n"
          send_user "Sting $expect_out(0,string)\n"
                  exit 2
            }
 timeout { send_user "timeout\n"; exit 3 }
 }
 EOF


 [Linux Dev:upncommn ~]$ cat expectecho.sh
 echo "hello"
 echo "abduls"
 echo "theos"
 echo "this is abdul"


 [Linux Dev:upncommn ~]$ ./expshl.sh
 spawn /home/upncommn/expectecho.sh
 hello
 abduls
 theos
 You said (buffer)
 Sting (0,string)


 [Linux Dev:upncommn ~]$ echo $?
 2

请帮我获取$ expect_out（缓冲区）和$ expect_out（0，字符串）。

Answer 1

Shell heredocs本质上是一个很大的双引号字符串。在 expect启动之前， shell 替换$expect_out变量（由于shell会话没有这样的变量，所以使用空字符串）。您需要单引用expect脚本体来保护shell中的expect变量：

expect << 'EOF'
# ........^...^
# everything else is the same

http://www.gnu.org/software/bash/manual/bashref.html#Here-Documents