In perl how to distiniguish between CLI & CGI mode

Question

Hi,

I am suppose to write perl-CGI script, which supports CLI & CGI mode. And I am unable to find the way to distinguish between two mode. I am looking for the way to check for mode whether it is CLI or CGI ?

So could you please let me know how to implement the logic?

Thanks in advance.

Answer 1

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";
}

Answer 2

At a guess, $ENV{'GATEWAY_INTERFACE'} will be NULL when run from the command line, and contain something (e.g. 1.1) when run as a CGI.

You'll need to try it out.