use strict;

my $files = "/perl/bin/ThisDirectoryHere";

opendir(DIR,$files) || die "Can not open directory: $!";
my @files = grep(!/^\.+$/, readdir(DIR));
close(DIR);

my $ct = 0;
#I need to open each file and change oldword to newword
for(@files) {
    #Read File
    open(IN, "$files/$_") || die "Can't open $_: $!\n";
    my @lines = map {$ct += s/oldword/newword/gi;$_} <IN>;
    close(IN);

    #Write File
    open(OUT, ">$files/$_");
    print OUT @lines;
    close(OUT)
}

print "\nTotal Changes = $ct\n";
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You state that you want to alter the contents of the files, yet you are not opening them to work on them after you have collected your file listing. Here is one way to alter the contents of each file, but the regex is far to simple in this case, and will probably alter more than it should.

my $base = '/perl/bin/thisdir';
my $count;

opendir(BASE, $base) or die "Cant open $base: $!\n";

for (grep( !/^\./, readdir(BASE) )) {
   open(IN, "$base/$_") or warn "Cant access $_: $!\n" and next;
   while (<IN>) {
      $count += s/old/new/gi;
   }
   close(IN);
}

closedir(BASE);

print "Total changes: $count\n";
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Looking at the code you presented, if you are attempting to actually alter the file names in the directory, you could have the following within the for( readdir ) loop

# snip..
   ( my $newfile = $_ ) =~ s/old/new/;
   rename("$base/$_", "$base/$nwewfile");
# snip..
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Update: Added counting to loop

use perl;

The glob function will exclude dotfiles for you. It would be a good idea to test that each filename is a regular file, and is readable and writable to you. There is a handy set of run flags in perl for sed-like operations like this, so I'll show how to call up a second perl process to do the work,

my $dir = "/perl/bin/ThisDirectoryHere";
my @files = grep { -f and -r _ and -w _} glob "$dir/*";
system '/usr/bin/perl', '-pi', '-e', 's/oldword/newword/gi', @files
    and die $?;
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The alternative is to set up a loop on @files as you have, opening each to read and a new file to write. Read, substitute, write, and when done, rename the new file to the old name. File locking (flock) may be advisable.

After Compline,
Zaxo

find /perl/bin/ThisDirectoryHere -type f | xargs perl -i -pe  's|oldwo
+rd/newword/gi'
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