Grep seems to be matching every line irrelevant of $cdLabel, what am I doing wrong? Is grep the best thing to use anyway?

Also what is the best way to make a backup of a file? ie: just making a copy of the file. I want to make this code portable so using the external cp command isn't an option. And my way of doing it works fine but is there a better way? I would like this script to be completely self reliant so a module isn't an option either. 

open DBFILE , "$dbFileName" or die $!;
my @dbFile = <DBFILE>;
close DBFILE;

if (grep $cdLabel, @dbFile) {
  print "This CD ($cdLabel) is already in the database\n";
  exit; 
}

# `cp -f $dbFileName $dbFileName.BAK`;

open DBFILEBK, ">$dbFileName.BAK" or die $!;
for (@dbFile) { print DBFILEBK; }
close DBFILEBK;

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In reply to grep problems and file copying issues by Viking

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