How to silence output in a Bash script?

Question

I have a program that outputs to stdout and would like to silence that output in a Bash script while piping to a file.

For example, running the program will output:<

Answer 1

All output:

scriptname &>/dev/null

Portable:

scriptname >/dev/null 2>&1

Portable:

scriptname >/dev/null 2>/dev/null

For newer bash (no portable):

scriptname &>-