You don't need to do a readdir first. You can leave that up to perl, by using: 
while( $file = <$id.'*'> ){
  do_something( $file );
}

[download]

The <> takes care of the filename expansion.

Hope this helps,

Jeroen
"We are not alone"(FZ)

Update:You can read about it in glob and perlop2. The latter makes me realize that you'll be better of with 

while( $file = glob "$id*" ){
  do_something( $file );
}

[download]

In reply to Re: removing a needle from a haystack by jeroenes
in thread removing a needle from a haystack by orthanc

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