You would need to declare $count with the my operator within the getISCount subroutine but before entering the loops.

Also reading again all your files to get the total count can be very inefficient if your files are large, whereas you only need to accumulate the individual line counts. Perhaps something like this, which stores the file names and file line counts in a hash for further use: 

use strict;
use warnings;
use Data::Dumper;

my $total_count;

my %files = map {$_, 0} glob "./s*.pl";
for my $key (keys %files) {
    my $count = getcount($key);
    $files{$key} = $count;
    $total_count += $count;
}

sub getcount {
    local @ARGV = @_;
    while (<>) {};
    return $.;
}

print Dumper \%files;
print "Total size = $total_count lines.\n";

[download]
which prints: 
$ perl  line_count.pl
$VAR1 = {
          './sum.pl' => '19',
          './summary.pl' => '16',
          './strict.pl' => '15',
          './schwartz2.pl' => '13',
          './sort_hash.pl' => '12',
          './separat.pl' => '28',
          './subdiscard3.pl' => '12',
          './schwartz.pl' => '27',
          './subdiscard2.pl' => '54',
          './scope.pl' => '16',
          './serv.pl' => '28',
          './shuffle.pl' => '21',
          './subdiscard.pl' => '23'
        };
total size = 284 lines.

[download]
If you only need to print the counts and don't need to store the values for further use, this can be simplified as follows: 
use strict;
use warnings;

my $total_count;

my @files = glob "./s*.pl";
for my $file (@files) {
    my $count = getcount($file);
    print "$file \t $count \n";
    $total_count += $count;
}

sub getcount {
    local @ARGV = @_;
    while (<>) {};
    return $.;
}

print "Total size = $total_count lines.\n";

[download]
which prints this: 
$ perl  line_count.pl
./schwartz.pl    27
./schwartz2.pl   13
./scope.pl       16
./separat.pl     28
./serv.pl        28
./shuffle.pl     21
./summary.pl     16
./sort_hash.pl   12
./strict.pl      15
./subdiscard.pl          23
./subdiscard2.pl         54
./subdiscard3.pl         12
./sum.pl         19
Total size = 284 lines.

[download]

In reply to Re: While loop double counting by Laurent_R
in thread While loop double counting by vihar

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