Test multiple file conditions in one swoop (BASH)?

Question

Often when writing for the bash shell, one needs to test if a file (or Directory) exists (or doesn\'t exist) and take appropriate action. Most common amongst these test are

Answer 1

This seems to work (notice the double brackets):

#!/bin/bash

if [[ -fwd "/Library/Application Support" ]]
then
    echo 'YES SIR -f -w -d are fine'
else
    echo 'no -f or -w or -d for you'
fi