Can't you just use an "unless" just the same? Is there an advantage/disadvantage to one or the other?

$year=1900;
unless($year==2000){     #notice unless instead of until
   print "blah blah $year\n";
   #now it works;
   $year++;
}
print "Done\n";
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Michael Jensen
InShift Technologies
http://www.inshift.com
michael@inshift.com