bash 期望脚本返回值
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原文地址: http://stackoverflow.com/questions/32341234/
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Expect Script Return Value
提问by MEric
I'm including simple Expect commands within a bash script (I know I could be just writing a pure Expect script but I would like to get it to work from within bash).
我在 bash 脚本中包含了简单的 Expect 命令（我知道我可能只是在编写一个纯 Expect 脚本，但我想让它在 bash 中工作）。
The script is below:
脚本如下：
#!/bin/bash
OUTPUT=$(expect -c '
spawn ssh [email protected]
expect "password:"
send "dog\r"
')
Upon ssh'ing to the above address, it will return something of the form mihail911's password:on the prompt so I think my expect line is valid. When I run this my script does not print anything. It does not even show the password:prompt. In general, even if I manually provide an incorrect password, I will receive a Incorrect password-type response prompt. Why is nothing printing and how can I get my script to execute properly? I have tried debugging by using the -dflag and it seems to show that at least the first expect prompt is being matched properly.
在通过 ssh 连接到上述地址后，它会mihail911's password:在提示中返回某种形式的内容，所以我认为我的期望行是有效的。当我运行它时，我的脚本不打印任何内容。它甚至不显示password:提示。一般情况下，即使我手动提供了错误的密码，我也会收到Incorrect password-type 的响应提示。为什么没有打印，如何让我的脚本正确执行？我已经尝试使用该-d标志进行调试，它似乎表明至少第一个期望提示匹配正确。
In addition, what values should I expect in the OUTPUTvariable? When I echothis variable, it simply prints the first the first command of the expect portion of the script and then mihail911's password:. Is this what it's supposed to be printing?
此外，我应该在OUTPUT变量中期望什么值？当我使用echo这个变量时，它只是打印脚本期望部分的第一个命令，然后打印mihail911's password:. 这是应该打印的吗？
回答by Dinesh
#!/bin/bash
OUTPUT=$(expect -c '
# To suppress any other form of output generated by spawned process
log_user 0
spawn ssh [email protected]
# To match some common prompts. Update it as per your needs.
# To match literal dollar, it is escaped with backslash
set prompt "#|>|\$"
expect {
eof {puts "Connection rejected by the host"; exit 0}
timeout {puts "Unable to access the host"; exit 0;}
"password:"
}
send "root\r"
expect {
timeout {puts "Unable to access the host"; exit 0;}
-re $prompt
}
send "date\r"
# Matching only the date cmd output alone
expect {
timeout { puts "Unable to access the host";exit 0}
-re "\n(\[^\r]*)\r"
}
send_user "$expect_out(1,string)\n"
exit 1
')
echo "Expect's return value : $?"; # Printing value returned from 'Expect'
echo "Expect Output : $OUTPUT"
Output :
输出 ：
dinesh@MyPC:~/stackoverflow$ ./Meric
Expect's return value : 1
Expect Output : Wed Sep 2 09:35:14 IST 2015
dinesh@MyPC:~/stackoverflow$
