#!/usr/bin/perl
use strict;
use warnings;

my $file = $ARGV[0] or die "Usage: $0 <input_file>";
open(my $fh, '<', $file) or die "Unable to open '$file' for reading: $!";
my ($line_cnt, $word_cnt, $char_cnt);
while (<$fh>) {
    chomp;
    $line_cnt++;
    $char_cnt += length($_);
    my @word = split " ", $_;
    $word_cnt += @word;
}