You only have to remember the last unique-line, a shot from the hip (untested!):
open(FILE, "<", name.ext") or die("couldn't open file: $!");
open(OUT, ">", new.ext") or die("couldn't open file for writing: $!")
+;
my $cmp = <FILE>; # the first line
print OUT $cmp; # is always unique
while(<FILE>) {
if ($_ ne $cmp) { # current line unlike last one?
print OUT $_; # print it out
$cmp = $_; # current line new reference
} # otherwise ignore
}
regards,
tomte
Hlade's Law:
If you have a difficult task, give it to a lazy person --
they will find an easier way to do it.
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