Date created: 2024-09-23

To immediately start a process as a background job:

firefox &

To run it in the background silenced:

firefox </dev/null &>/dev/null &

The whole story

The above is a shorthand for starting a process normally, then stopping it by hitting <C-z>, and typing bg into the terminal. This resumes the process as a background job. In this scenario its stdout/stderr/stdin are still connected to the terminal - meaning it's not silenced.