相关疑难解决方法(0)

我尝试过cat /dev/zero，但似乎没有任何作用。我用谷歌搜索/dev/zero，它说它基本上是一个无限大小的空白文件。是否cat打印无限数量的不存在的字符？这是如何运作的？如果它是 0 字节，它如何提供无限数据？如果可以简单地创建一个空白文件，该文件有什么用途？

根据FHS关于/dev：

• 6.1.3. /dev ：设备和特殊文件

它包含了：

The following devices must exist under /dev.

/dev/null
      All data written to this device is discarded. A read from this device will return an EOF condition.

/dev/zero
      This device is a source of zeroed out data. All data written to this device is discarded. A read from this device will return as many bytes containing the value zero as was requested.
...

观察两者都有：

All data written to this device is discarded …