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$ tar xf $HOME/Downloads/kyotocabinet-1.2.77.tar.gz
$ cd kyotocabinet-1.2.77
...
$ make -j2
$ sudo make install
$ cd ..

$ tar xf $HOME/Downloads/kyotocabinet-perl-1.20.tar.gz
$ cd kyotocabinet-perl-1.20
...
$ cd doc
$ open index.html in a web browser
$ cd ../..

use strict;
use warnings;
...
}

close $fh_a;

use strict;
use warnings;
...
}

close $fh_b;

use strict;
use warnings;
...

close $fh_a;
$db->close;

use strict;
use warnings;
...

close $fh_b;
$db->close;

$ ls -lh
total 1705800
...
 16666650 input_b.txt
 26666640 output.txt
 53333280 total

000000001D x m
000000001D x n
...
000000003E t m
000000003E t s
...