in reply to Re: Finding un-paired files in a directory
in thread Finding un-paired files in a directory

opendir DIR, $dir
  or die "Couldn't open directory '$dir' : $!";
my @files = grep { /(.*)\.mrg$/ and not -f "$1.did" } readdir DIR;
closedir DIR

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No, that's testing "-f" on a file in the current directory for a name that should be checked in a different directory. A traditional readdir mistake. {grin}

-- Randal L. Schwartz, Perl hacker
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Re^3: Finding un-paired files in a directory
by Coruscate (Sexton) on Dec 02, 2003 at 21:26 UTC

    Which is why globing can be so lovely, as it includes the file path for you :) I'm not sure if this is any faster than Abigail-II's solution. At least this does only check for the existence of each file once rather than two checks. 

    my $dir = '/path/to/dir';

print join ", ", grep {
  /(.*)\.mrg\z/ and not -f "$1.did"
} <$dir/*\.mrg>'

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[d/l]

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