如何区分CLI和Perl中的CGI模式
问题描述：
我应该编写一个Perl脚本，该脚本既可以在命令行中运行，也可以作为CGI脚本运行。我无法确定如何区分这两种模式。
I am supposed to write a Perl script which can be run both on the command line and as a CGI script. I haven't been able to determine how I should distinguish between the two modes.
那么您能不能让我知道如何实现逻辑？
So could you please let me know how to implement the logic?
答
您可以检查是否存在任意数量的 CGI环境变量，例如：
You can check for the presence of any number of CGI environment variables, e.g.:
if ($ENV{GATEWAY_INTERFACE})
{
print "Content-type: text/plain\n\nLooks like I'm a CGI\n";
}
else
{
print "I'm just a plain command line program\n";
}