Question

The size of /dev/null is always zero.

(a) True

(b) False

I have been asked this question during an interview.

My question comes from Redirection and Pipes in section The Shell of Unix

Answer 1

Right option is (a) True

To explain: UNIX has a special file that simply accepts any stream without growing in size. This file is /dev/null. This file is used for redirecting error messages away from the terminal so that they don’t appear on the screen. This file is pseudo-device because like other device files, it’s not associated with any physical device.