https://www.debian.org/doc/manuals/debian-faq/ch-ftparchives#s-pools
6.10 What's in the pool directory?
Packages are kept in a large `pool', structured according to the name of the source package. To make this manageable, the pool is subdivided by section (`main', `contrib' and `non-free') and by the first letter of the source package name. These directories contain several files: the binary packages for each architecture, and the source packages from which the binary packages were generated.
You can find out where each package is placed by executing a command like apt-cache showsrc mypackagename and looking at the `Directory:' line. For example, the apache packages are stored in pool/main/a/apache/.
Additionally, since there are so many lib* packages, these are treated specially: for instance, libpaper packages are stored inpool/main/libp/libpaper/.
These directories contain several files: the binary packages for each architecture, and the source packages from which the binary packages were generated.
これらのディレクトリには、アーキテクチャごとのバイナリパッケージと バイナリパッケージが生成された ソースパッケージという複数のファイルが含まれています。近づいてきた。 アタマ痛いなぁ。 ゆっくり読んでいこう。
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メモ 4,294,967,296だと33bitになるから当たり前か、、