Why does someone like to write/dev/null in linux?

Token has something, But input devnull to check whether there is anything. = 1>/dev/null 2> & 1 &
Why do I write it in/dev/nullcontext? I have tested that there is something in the input a.txt, but there is nothing in the input/dev/null.

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= 1>/dev/null 2> & 1 &
Why do I write it in/dev/nullcontext? I have tested that there is something in the input a.txt, but there is nothing in the input/dev/null.

/Dev/null is a black hole.
It is mainly used to discard output information.

This is output redirection and does not display standard output (STDOUT) and error message (STDERR)

/Dev/null is a black hole. Nothing is thrown in.
Therefore, use/dev/null.

You can understand that dev/null is a garbage dump, or a black hole, and nothing goes in .. Locate some useless output here and it will disappear...

/Dev/null is a special character device in linux. It is mainly used to discard output information and filter out error information, which helps you quickly find the cause of the error.

This is the result. When an error is handled, the output from stderr is discarded to the file/dev/null. /Dev/null is a special device file, and any data it receives will be discarded. A null device is also known as a black hole because all the data here will not be returned.

Output redirection
Http://c.biancheng.net/cpp/view/2738.html for reference to this article