“apt-get clean”和“apt-get clean all”有什么区别？

Question

如果有的话，此命令之间的区别是什么：

sudo apt-get clean

而这个命令：

sudo apt-get clean all

在我的 Lubuntu 12.04 系统上，模拟这些命令显示它们的行为完全相同：

ek@Apok:~$ apt-get -s clean
NOTE: This is only a simulation!
      apt-get needs root privileges for real execution.
      Keep also in mind that locking is deactivated,
      so don't depend on the relevance to the real current situation!
Del /var/cache/apt/archives/* /var/cache/apt/archives/partial/*
Del /var/cache/apt/pkgcache.bin /var/cache/apt/srcpkgcache.bin
ek@Apok:~$ apt-get -s clean all
NOTE: This is only a simulation!
      apt-get needs root privileges for real execution.
      Keep also in mind that locking is deactivated,
      so don't depend on the relevance to the real current situation!
Del /var/cache/apt/archives/* /var/cache/apt/archives/partial/*
Del /var/cache/apt/pkgcache.bin /var/cache/apt/srcpkgcache.bin
ek@Apok:~$

是否有过任何差别apt-get的同行为clean和clean all？如果是，有什么区别，在什么情况下是相关的，我应该如何在两者之间进行选择？如果没有区别，那为什么clean all存在？

如果它们相同，那么clean all如果clean通常可以将包名称作为参数仍然有意义。但事实并非如此——尝试将包名传递给clean根本不会改变clean的行为，整个缓存仍然会被删除：

ek@Apok:~$ apt-get -s clean nano
NOTE: This is only a simulation!
      apt-get needs root privileges for real execution.
      Keep also in mind that locking is deactivated,
      so don't depend on the relevance to the real current situation!
Del /var/cache/apt/archives/* /var/cache/apt/archives/partial/*
Del /var/cache/apt/pkgcache.bin /var/cache/apt/srcpkgcache.bin

不过，这确实让我想知道，是否可能clean all 真的不存在（并且正在发生的事情all被忽略了，就像nano上面的例子一样）。

是否clean all只是一个都市传说？

Answer 1

在

sudo apt-get clean all

all只是被忽略，就像你在clean.

与例如相同

sudo apt-get clean my room