opendir my $DIR, '.' or die "Can't opendir . : $!\n";
my %single;
my %other = (did => 'mrg', mrg => 'did');
while (my $file = readdir $DIR) {
#print "$file\n";
my ($name,$ext) = ($file =~ /^(.*)\.(did|mrg)$/)
or next;
if (exists $single{"$name.$other{$ext}"}) {
delete $single{"$name.$other{$ext}"};
} else {
$single{$file} = undef;
}
}
print "Unpaired files:\n";
foreach my $file (keys %single) {
print "\t$file\n";
}
A bit longer than most but if the readdir gives you the filenames in order (my does), there is a lot of such files and only a minimum unpaired I believe it would be the quickest and least memory hungry.
Update: Of course if your filesystem is case insensitive you should lowercase the filename to make sure you look for the pairs case insensitively. You may want store the original case in the %single hash in such case.
Jenda
Always code as if the guy who ends up maintaining your code
will be a violent psychopath who knows where you live.
-- Rick Osborne
Edit by castaway: Closed small tag in signature
-
Are you posting in the right place? Check out Where do I post X? to know for sure.
-
Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
<u> <ul>
-
Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
intervention).
-
Want more info? How to link
or How to display code and escape characters
are good places to start.
|