Hello, I have a main function which almost works but it it lacks at someplaces.

My script's requirement is that it should run by default without any arguments but if the user wants to run the script with a custom file then he/she should use -c "filename with path"

It would be good if the script could also validate the xml file which is being passed as an argument under elsif condition

Main Function

          if (@ARGV > 0) {

                if ( $ARGV[0] eq "-c") {
                    if (  ! -e "$ARGV[1]" ) {
                        print "Provided xml file doesnot exists\n";
                        }
                    elsif ( -f "$ARGV[1]") {
                        $controlfile = $ARGV[1];
                        parse_xml();
                        update_exports();
                        }

                    }
        else {
                usage ();
            }
        }
            elsif (@ARGV eq 0) {
                $controlfile = 'network.xml';
                parse_xml();
                update_exports();
                exit 0;
        }
[download]

Here everything works untill I only run

# perl script.pl -c
Use of uninitialized value $ARGV[1] in string at nfs_security.pl line 
+171.
Provided xml file doesnot exists
[download]

Here how can I print a warning message along with usage so that when $ARGV1 is not provided throw a warning

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