/Dev/null and/dev/zero files

1./dev/null
/Dev/null is equivalent to a black hole, and the data written into it will be lost forever. No data can be read from it.
In general,/dev/null is used to block shell error output.
./Myshell. Sh 2>/dev/null
The preceding command is used to execute a custom shell. If an error message is displayed during execution, the error message is redirected to/dev/null so that it is not displayed on the screen.
In addition, you can create a symbolic link to link a file (such as an advertisement file when surfing the Internet) to/dev/null. In this way, it will not be saved on the disk.
2./dev/zero
The content written to/dev/Zero will be lost. The data read from/dev/zero is a series of null values (Binary zero streams ).
This feature of/dev/Zero can be used to fill files.