Another way of doing this (hey, this is TIMTOWTDIMonks after all) is to make use of the fact that $ARGV gets set to the current file: 
my $file;
while(<>) {
  print "Changing file to: $file\n" if ( qq/$file/ ne ( $file=$ARGV));
  print;
}

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CU
Robartes-

In reply to Re: Determining new file by robartes
in thread Determining new file by Anonymous Monk

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