在perl / cgi文件中运行系统命令时缺少输出 [英] Missing output when running system command in perl/cgi file

问题描述

我需要编写一个CGI程序，它将显示一个系统命令的输出：

I need to write a CGI program and it will display the output of a system command:

echo "++++++"  
VAR=$(expect -c " spawn ssh -o StrictHostKeyChecking=no $USER@$HOST $CMD match_max 
100000 expect \"*?assword:*\" send -- \"$PASS\r\" send -- \"\r\" expect eof ") 
echo $VAR 
echo "++++++"

在CGI文件中：

my $command= "ksh ../cgi-bin/script.sh";
my @output= `$command`; 
print @output;

最后，当我在unix中运行CGI文件时， $ VAR 是一个非常长的字符串，包括\\\
和一些分隔符。但是，当我在网络服务器上运行时，输出是

Finally, when I run the CGI file in unix, the $VAR is a very long string including \n and some delimiters. However, when I run on web server, the output is

++++++

++++++

因此在传递Web界面/浏览器时，缺少 $ VAR 。
我知道也许问题是 $ VAR 是很长的字符串。

So $VAR is missing when passing in the web interface/browser. I know maybe the problem is $VAR is very long string.

但是无论如何，除了将输出写入文件然后从浏览器中检索之外，还是要解决这个问题吗？

But anyway, is there anyway to solve this problem except writing the output to a file then retrieve it from browser?

感谢您对我的问题感兴趣。

Thanks if you are interested in my question.

推荐答案

script.sh 使用多个环境变量： $ USER ， $ HOST ， $ CMD 和 $ PASS 。 CGI环境将具有与登录Shell不同的环境变量集。在调用 script.sh 之前，您可能需要从CGI脚本中设置这些变量。

script.sh uses several environment variables: $USER, $HOST, $CMD and $PASS. The CGI environment will have different environment variables set than a login shell. You may need to set these variables from your CGI script before calling script.sh.

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