The default path for the cgi-bin is

/var/www/cgi-bin

that are served up by requests to

http://<server>/cgi-bin/<myscript.pl>

In order for scripts to be executed in that directory, security needs to be set on the file.  For example:

chmod a+x myscript.pl

An example of a Perl script is something like this:

#!/usr/bin/perl
print "Content-type: text/html\n\n";
print "Hello world!";

When trying to use CGI.pm in your script with something like:

#!/usr/bin/perl
use CGI qw(:standard);
print header;
print start_html("Welcome!\n");
print h1("My Page");
print h2("page 1...");
print end_html;

And it produces an “Error 500 Internal Server Error” on your browser, but the previous example worked, you’re probably missing perl-CGI. Try installing it using:

yum install perl-CGI

I discovered it was missing when running this command from /:

find -iname CGI.*

Nothing was found. After I ran the installation of perl-CGI, the file is now located here:

/usr/share/perl5/CGI.pm