In Linux how do you make a command run in the background without it outputting to the screen?

Question

I know this sounds like a silly question at first glance, but I've tried everything. I want to execute the command arpspoof in the Kali Linux terminal but I do not want to see the endless output.

First I try this:

arpspoof -t 10.1.1.1 10.1.1.2 >/dev/null

And it still outputs to the screen. Then I try this:

arpspoof -t 10.1.1.1 10.1.1.2 & >/dev/null

And it still outputs to the screen. Then I add another one at the end:

arpspoof -t 10.1.1.1 10.1.1.2 & >/dev/null &

And it still outputs to the freakin screen.

Answer 1

Try

arpspoof -t 10.1.1.1 10.1.1.2 2>/dev/null 1>/dev/null &

where:

arpspoof -t 10.1.1.1 10.1.1.2 is your command

2>/dev/null redirects standard error (STDERR) to the "bit bucket"

1>/dev/null redirects standard out (STDOUT) to the "bit bucket"

& sets the entire command line to run in the background

This line of code is more verbose and perhaps clearer to understand.