Debian / Ubuntu Linux 預設 APT 下載的暫存目錄 /var/cache/apt
但是若有被修改，可以使用 apt-config 來查詢：
- eval $(apt-config shell CACHE Dir::Cache)
- eval $(apt-config shell ARCHIVES Dir::Cache::archives)
- echo /${CACHE}/${ARCHIVES} # 可以看到完整路徑
Debian / Ubuntu Linux 安裝套件的下載暫存路徑
查詢暫存目錄指令：
- apt-config shell Cache Dir::Cache
- apt-config shell Cache Dir::Cache::Archives
在 Docker 安裝套件，在 Cache 資料夾都找不到任何東西，是因為 Docker 有個 docker-clean 設定不存 Cache
- cat /etc/apt/apt.conf.d/docker-clean
# Since for most Docker users, package installs happen in "docker build" steps,
# they essentially become individual layers due to the way Docker handles
# layering, especially using CoW filesystems. What this means for us is that
# the caches that APT keeps end up just wasting space in those layers, making
# our layers unnecessarily large (especially since we'll normally never use
# these caches again and will instead just "docker build" again and make a brand
# new image).# Ideally, these would just be invoking "apt-get clean", but in our testing,
# that ended up being cyclic and we got stuck on APT's lock, so we get this fun
# creation that's essentially just "apt-get clean".
DPkg::Post-Invoke { "rm -f /var/cache/apt/archives/.deb /var/cache/apt/archives/partial/.deb /var/cache/apt/.bin || true"; };
APT::Update::Post-Invoke { "rm -f /var/cache/apt/archives/.deb /var/cache/apt/archives/partial/.deb /var/cache/apt/.bin || true"; };Dir::Cache::pkgcache "";
Dir::Cache::srcpkgcache "";# Note that we do realize this isn't the ideal way to do this, and are always
# open to better suggestions (https://github.com/debuerreotype/debuerreotype/issues). - 想要留套件資料，把這個檔案砍掉即可：rm /etc/apt/apt.conf.d/docker-clean
