Script to sieve brew packages and get list of standalone and dependants

BrewClean.sh

#!/usr/bin/env zsh

OLDIFS=$IFS
IFS=$'\r\n' 
GLOBIGNORE='*' 
command eval  'BrewList=($(brew list))'

Dependent=()
Independent=()

for b in "${BrewList[@]}"; do
    printf '.'
    Deps=$(brew uses --installed $b | tr '\n' ' ')
    if [[ -z "$Deps" ]]; then
        Independent+=("$b")
    else
        Dependent+=("$b : $Deps")
    fi
done

echo "\n-------------With Dependants---------------\n"
printf '%s\n' "${Dependent[@]}"
echo "\n-------------Standalone---------------\n"
printf '%s\n' "${Independent[@]}"