I tried your suggestion, but still face the same error message..

===============

use File::Find;
use strict;

my $path = "."; # default path
my $num  = 10; # -n default number of users
my $num_flag = 0;
my @paths ;  # array to hold paths
my $num_paths = 0;
my @subpaths ;
my $size = 0;

foreach my $argv (@ARGV) {
    
    # if it matches dash     
    if ( $argv =~ m/^-/ ) {
    $num_flag++;
    if ($num_flag > 1) {
            print STDERR "Cannot have more than one entry for number o
+f users\n";
        usage_exit(1);
    }
        $num = substr($argv, 1);
        print ("num is, $num\n");
    }

    # if it matches slash or is a path    
    if ( $argv =~ m/^\// ) {
        push @paths, <$argv/*> unless @ARGV;
        print ("argv, $argv\n");
        print ("num_path, $num_paths\n");
        $num_paths++;
    }
}

# set default path if no path argument is supplied
if ($num_paths == 0) {
    @paths = <$path/*>;
    print ("assigning default path\n");
}

my $i=0;

foreach $i (@paths) {
    print ("atpaths, \n");       
}

my %size;
my @sorted;

find (sub {
         $size{$File::Find::name} = -s if -f || -l; }, @paths
);
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