“ apt-get clean”和“ apt-get clean all”有何区别？

该命令之间的区别是什么（如果有的话）：

sudo apt-get clean

而这个命令：

sudo apt-get clean all

在我的Lubuntu 12.04系统上，模拟这些命令可以发现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:~$

是否有过任何的区别apt-get与的行为clean和clean all？如果是这样，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存在呢？

如果它们相同，那么通常可以将包名称作为参数clean all仍然有意义clean。但这不是事实-尝试将软件包名称传递给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

但是，这确实使我感到疑惑，也许clean all 它根本不存在（all就像nano上面的示例一样，正在发生的事情被忽略了）。

是否clean all只是一个都市传说？

在

sudo apt-get clean all

all只会被忽略，就像您在之后附加的其他任何内容一样clean。

例如是一样的

sudo apt-get clean my room