open my $ih, '<', $fin or die "cannot open $fin for reading, $!"; 
$ih =~ s/\n+/\n/g;

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Substitution on a filehandle? It does not execute the substitution on the file content, though. You can verify it with
$ih =~ s/\n+/\n/g or warn "No subst\n";

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In reply to Re: Sub routines by choroba
in thread Sub routines by velocitymodel

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