system(qq{./resize.cgi ss="$gal_securestring" fh="$file_hash"});

use CGI;

my $cgi = new CGI;

my $gal_securestring = $cgi->param('ss');
my $file_hash        = $cgi->param('fh');

perl -wle'
use CGI;
my $cgi = CGI->new;
print $cgi->param("test");
print $cgi->param("test2");
' test=23 test2=42
23
42

DEBUGGING
       If you are running the script from the command line or in the perl debugger, you can pass the
       script a list of keywords or parameter=value pairs on the command line or from standard input
       (you don’t have to worry about tricking your script into reading from environment variables).
       You can pass keywords like this:

           your_script.pl keyword1 keyword2 keyword3
[...]