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use strict;
use warnings;
use Tie::File;
# usage: perl script.pl [file1] [file2] [...]
foreach my $file (grep { -f } @ARGV) {
tie my @file, 'Tie::File', $file
or die "Can't tie into file $file: $!";
my $regex = qr/\sSIL\s*\z/;
foreach my $i (reverse 0 .. $#file) {
if ($file[$i] =~ /$regex/) {
1 while ($file[--$i] =~ /$regex/);
print "$file[$i + 1]\n";
$#file = $i + 1;
last;
}
}
untie @file;
}
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